Windows Update Client 8.1

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  1. Windows Update Agent Win 8.1
  2. Windows Update Client 8.1 64-bit

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This tutorial contains several methods to fix Windows Update Problems in Windows 7/8/8.1 & Server 2008/2012 OS. In many cases, even in fresh Windows installations, the Windows Update is not working as expected, or it stuck when checking for updates or it displays several errors whenever you try to search for the available updates. Windows Update MiniTool is a free third-party client for searching for, installing and blocking updates for the Windows operating system. When it comes to updates for Windows, most devices running the Windows operating system are most likely updated through some form of first-party update service such as Windows Update.

This article describes how to update the Windows Update Agent to the latest version.

Original product version: Windows 10 - all editions, Windows Server 2012
Original KB number: 949104

Summary

If you have automatic updating turned on, the latest version of the Windows Update Agent is downloaded and installed automatically on your computer. Or, you can manually download and install the Windows Update Agent.

Automatically download Windows Update Agent

To download the Windows Update Agent automatically, follow these steps:

  1. Turn on automatic updating. Follow these steps, for the version of Windows that you are running.

    • Windows 8.1 or Windows 8

      1. Open Windows Update by swiping in from the right edge of the screen (or, if you're using a mouse, pointing to the lower-right corner of the screen and moving up the mouse pointer), tapping or clicking Settings, tapping or clicking Control Panel, and then tapping or clicking Windows Update.
      2. Tap or click Change settings.
      3. Under Important updates, choose Install updates automatically.
      4. Under Recommended updates, select the Give me recommended updates the same way I receive important updates check box, and then select OK.
    • Windows 7, Windows Vista, or Windows XP

      To turn on automatic updating automatically, select the Fix it button or link, and then select Run in the View Download dialog box. Then, follow the steps in the Fix it wizard.

  2. Restart the Windows Update service. To do this, follow these steps:

    1. Press the Windows logo Key+R to open the Run box.
    2. Type services.msc in the Run box, and then press Enter.
    3. Right-click Windows Update in the Services management console, and then select Stop. If you are running Windows XP, right-click Automatic Updates, and then select Stop.
    4. After Windows Update stops, right-click Windows Update, and then select Start. If you are running Windows XP, right-click Automatic Updates, and then select Start.
  3. Wait for Windows Update to start, and then verify that the Windows Update Agent is updated.

Manually download Windows Update Agent from Microsoft Download Center

Click the download link for your version of Windows to obtain the latest Windows Update Agent.

Stand-alone packages for Windows 8 and Windows Server 2012

The following files are available for download from the Microsoft Download Center.

Operating systemUpdate
All supported x86-based versions of Windows 8 (KB2937636)Download the package now.
All supported x64-based versions of Windows 8 (KB2937636)Download the package now.
All supported x64-based versions of Windows Server 2012 (KB2937636)Download the package now.

Stand-alone packages for Windows 7 SP1 and Windows Server 2008 R2 SP1

The following files are available for download from Windows Update.

Operating systemUpdate
All supported x86-based versions of Windows 7 SP1Download the package now.
All supported x64-based versions of Windows 7 SP1Download the package now.
All supported x86-based versions of Windows Server 2008 R2 SP1Download the package now.
All supported x64-based versions of Windows Server 2008 R2 SP1Download the package now.
All supported Itanium-based versions of Windows Server 2008 R2 SP1Download the package now.

Note

Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 with update 2919355 already include the latest version of the Windows Update Agent.

More information

If you receive a Windows Update error, try Solutions for common Windows Update errors.

For more information about how to check which version of the Windows Update Agent is installed, follow these steps:

  1. Open the %systemroot%system32 folder. %systemroot% is the folder in which Windows is installed. For example, the %systemroot% folder is C:Windows.
  2. Right-click Wuaueng.dll, and then select Properties.
  3. Select the Details tab, and then locate the file version number.

Note

The latest version of the Windows Update Agent for Windows 8.1 is 7.9.9600.16422. The latest version of the Windows Update Agent for Windows 8 is 7.8.9200.16693. The latest version of the Windows Update Agent for Windows 7, Windows Vista, and Windows XP is 7.6.7600.256.

Improvements in version 7.6.7600.256 of Windows Update Agent

  • A hardened infrastructure so that the Windows Update client will trust only those files that are signed by a new certificate. The certificate is used solely to protect updates to the Windows Update client.

  • A more secure communication channel for the Windows Update client

Improvements in version 7.4.7600.226 of Windows Update Agent

  • Improved scan times for Windows updates.
  • Improved Windows Update UI for computers that are running Windows Vista or Windows Server 2008.
  • More visible and detailed descriptions of updates.
  • Improvements in how users are notified about service packs.

Issues that are fixed in version 7.2.6001.788 of Windows Update Agent

Version 7.2.6001.788 of the Windows Update Agent fixes the following issue. This issue was not previously documented in a Microsoft Knowledge Base article:

  • When you try to install 80 or more updates at the same time from Windows Update or Microsoft Update, you receive a '0x80070057' error code.

Improvements in version 7.2.6001.784 of Windows Update Agent

  • Improved scan times for Windows Update
  • Improved speed at which signature updates are delivered
  • Support for Windows Installer reinstallation
  • Improved error messaging

Issues that are fixed by version 7.0.6000.381 of Windows Update Agent

Version 7.0.6000.381 of the Windows Update Agent fixes the following issues. These issues were not previously documented in a Microsoft Knowledge Base article:

  • The Background Intelligent Transfer Service (BITS) crashes on a Windows Vista-based computer. For more information, see An update is available to fix a Background Intelligent Transfer Service (BITS) crash on a Windows Vista-based computer.
  • A fix is included that reduces the number of restarts that are required for the stand-alone installer when Multilingual User Interface Pack (MUI) files are being used.
  • User interface elements in the Korean, Simplified Chinese, and Traditional Chinese languages are fixed.
  • The Windows Vista installation experience is improved.

Windows Update helps keep your computer up-to-date and secure by downloading and installing the latest security and other updates from Microsoft. Windows Update determines which updates apply to your computer.

Microsoft periodically makes software updates available to users of Windows and other Microsoft software. These include updates that improve reliability and performance, updates that provide new protections against malware and other potentially unwanted software, and upgrades to Windows features. To improve the performance or the reliability of hardware components on the computer, Microsoft may also provide updates to device drivers that are supplied by the computer manufacturer.

If you turn on Windows Update, software components that are directly related to Windows Update will have to be updated occasionally on your computer. These updates must be performed before Windows Update can check for required updates or before it can install other updates. These required updates fix errors, provide ongoing improvements, and maintain compatibility with the Microsoft servers that support Windows Update. If you disable Windows Update, you will not receive these updates.

Windows Update is configured to install updates automatically when you select the recommended option during Windows Out Of Box Experience (OOBE) Setup. You can also turn on Windows Update by selecting one of following settings in the Automatic Updates item in Control Panel:

  • Automatic (recommended).
  • Download updates for me, but let me choose when to install them.
  • Notify me, but don't automatically download or install them.

After you turn on Windows Update, the required updates to components of Windows Update will be downloaded and installed automatically without notifying you. This behavior occurs regardless of which setting you use to turn on Windows Update. If you do not want to receive required updates, you can disable automatic updates in Control Panel.

The updates to Windows Update itself typically do the following: Address feedback from customers, improve compatibility, service performance and reliability, and enable new service capabilities. When the Windows Update server is updated, a corresponding client update is typically required. During an agent self-update operation, Windows Update Agent files may be added, modified, or replaced. For example, Windows Update Agent files that help display the user experience or that determine whether updates apply to a particular system may be added. This behavior occurs when a system is set to automatically check for available updates. This does not occur when automatic updates are turned off. For example, this behavior does not occur if you select Never check for updates in Windows Vista and Windows 7 or if you select Turn off Automatic Updates in Windows XP.

Administrators will receive the latest version of the Windows Update Agent for deployment through Windows Server Update Services (WSUS).

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Original product version: Windows 10, version 1809 and later versions, Windows Server 2012 R2, Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1
Original KB number: 947821

Symptom

Windows updates and service packs may fail to install if there are corruption errors. For example, an update might not install if a system file is damaged. The DISM or System Update Readiness tool may help you to fix some Windows corruption errors.

This article is intended for Support agents and IT professionals. If you are home users and looking for more information about fixing Windows update errors, see Fix Windows Update errors.

Resolution for Windows 10 and Windows Server 2012 R2

To resolve this problem, use the inbox Deployment Image Servicing and Management (DISM) tool. Then, install the Windows update or service pack again.

  1. Open an elevated command prompt. To do this, swipe in from the right edge of the screen, and then tap Search. Or, if you are using a mouse, point to the lower-right corner of the screen, and then select Search. Type Command Prompt in the Search box, right-select Command Prompt, and then select Run as administrator. If you are prompted for an administrator password or for a confirmation, type the password, or select Allow.

  2. Type the following command, and then press Enter. It may take several minutes for the command operation to be completed.

    Important

    When you run this command, DISM uses Windows Update to provide the files that are required to fix corruptions. However, if your Windows Update client is already broken, use a running Windows installation as the repair source, or use a Windows side-by-side folder from a network share or from a removable media, such as the Windows DVD, as the source of the files. To do this, run the following command instead:

    Note

    Replace the C:RepairSourceWindows placeholder with the location of your repair source. For more information about using the DISM tool to repair Windows, reference Repair a Windows Image.

  3. Type the sfc /scannow command and press Enter. It may take several minutes for the command operation to be completed.

  4. Close the command prompt, and then run Windows Update again.

8.1

DISM creates a log file (%windir%/Logs/CBS/CBS.log) that captures any issues that the tool found or fixed. %windir% is the folder in which Windows is installed. For example, the %windir% folder is C:Windows.

Windows Update Agent Win 8.1

Resolution for Windows 7 Service Pack 1 (SP1) and Windows Server 2008 R2 SP1

To resolve this problem, use the System Update Readiness tool. Then, install the Windows update or service pack again.

  1. Download the System Update Readiness tool.

    select the download link in the following table that corresponds to the version of Windows that is running on your computer. For more information about how to find the version of Windows that you installed, see Find out if your computer is running the 32-bit or 64-bit version of Windows.

    Note

    This tool is updated regularly, we recommend that you always download the latest version. This tool is not available in every supported language. Check the link below to see if it is available in your language.

    Operating systemDownload link
    x86-based (32-bit) versions of Windows 7 SP1
    Download the package now.
    x64-based (64-bit) versions of Windows 7 SP1
    Download the package now.
    x64-based (64-bit) versions of Windows Server 2008 R2 SP1
    Download the package now.
    Itanium-based versions of Windows Server 2008 R2 SP1
    Download the package now.
  2. Install and run the tool.

    1. Select Download on the Download Center webpage, then do one of the following:

      • To install the tool immediately, select Open or Run, and then follow the instructions on your screen.
      • To install the tool later, select Save, and then download the installation file to your computer. When you're ready to install the tool, double-select the file.
    2. In the Windows Update Standalone Installer dialog box, select Yes.

  3. When the tool is being installed, it automatically runs. Although it typically takes less than 15 minutes to run, it might take much longer on some computers. Even if the progress bar seems to stop, the scan is still running, so don't select Cancel.

  4. When you see Installation complete, select Close.

  5. Reinstall the update or service pack you were trying to install previously.

To manually fix corruption errors that the tool detects but can't be fixed, see How to fix errors that are found in the CheckSUR log file.

Resolution - Download the package from Microsoft Update Catalog directly

Windows Update Client 8.1 64-bit

You can also try to directly download the update package from Microsoft Update Catalog, and then install the update package manually.

For example, you may have problems when you try to install updates from Windows Update. In this situation, you can download the update package and try to install the update manually. To do this, follow these steps:

  1. Open Microsoft Update Catalog in Internet Explorer.

  2. In the search box, input the update number that you want to download. In this example, input 3006137. Then, select Search.

  3. Find the update that applies to your operating system appropriately in the search results, and then select Add to add the update to your basket.

  4. Select view basket to open your basket.

  5. Select Download to download the update in your basket.

  6. Select Browse to choose a location for the update you are downloading, and then select Continue.

  7. Select Close after the download process is done. Then, you can find a folder that contains the update package in the location that you specified.

  8. Open the folder, and then double-select the update package to install the update. Lpn to adn programs in missouri download free.

If the Windows update or service pack installed successfully, you are finished. If the problem is not fixed, or if System Update Readiness Tool cannot find the cause, contact us for more help.

Description of the common corruption errors

The following table lists the possible error code with Windows Update for your reference:

CodeErrorDescription
0x80070002ERROR_FILE_NOT_FOUNDThe system cannot find the file specified.
0x8007000DERROR_INVALID_DATAThe data is invalid.
0x800F081FCBS_E_SOURCE_MISSINGThe source for the package or file not found.
0x80073712ERROR_SXS_COMPONENT_STORE_CORRUPTThe component store is in an inconsistent state.
0x800736CCERROR_SXS_FILE_HASH_MISMATCHA component's file does not match the verification information present in the component manifest.
0x800705B9ERROR_XML_PARSE_ERRORUnable to parse the requested XML data.
0x80070246ERROR_ILLEGAL_CHARACTERAn invalid character was encountered.
0x8007370DERROR_SXS_IDENTITY_PARSE_ERRORAn identity string is malformed.
0x8007370BERROR_SXS_INVALID_IDENTITY_ATTRIBUTE_NAMEThe name of an attribute in an identity is not within the valid range.
0x8007370AERROR_SXS_INVALID_IDENTITY_ATTRIBUTE_VALUEThe value of an attribute in an identity is not within the valid range.
0x80070057ERROR_INVALID_PARAMETERThe parameter is incorrect.
0x800B0100TRUST_E_NOSIGNATURENo signature was present in the subject.
0x80092003CRYPT_E_FILE_ERRORAn error occurred while Windows Update reads or writes to a file.
0x800B0101CERT_E_EXPIREDA required certificate is not within its validity period when verifying against the current system clock or the time stamp in the signed file.
0x8007371BERROR_SXS_TRANSACTION_CLOSURE_INCOMPLETEOne or more required members of the transaction are not present.
0x80070490ERROR_NOT_FOUNDWindows could not search for new updates.
0x800f0984PSFX_E_MATCHING_BINARY_MISSINGMatching component directory exist but binary missing
0x800f0986PSFX_E_APPLY_FORWARD_DELTA_FAILEDApplying forward delta failed
0x800f0982PSFX_E_MATCHING_COMPONENT_NOT_FOUNDCan't identify matching component for hydration

What does the System Update Readiness tool do

Verify the integrity of resources

The System Update Readiness tool verifies the integrity of the following resources:

  • Files that are located in the following directories:
    • %SYSTEMROOT%ServicingPackages
    • %SYSTEMROOT%WinSxSManifests
  • Registry data that is located under the following registry subkeys:
    • HKEY_LOCAL_MACHINEComponents
    • HKEY_LOCAL_MACHINESchema
    • HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionComponent Based Servicing

This list may be updated at any time.

When the System Update Readiness tool detects incorrect manifests, Cabinets, or registry data, it may replace the incorrect data with a corrected version.

Logging

The System Update Readiness tool creates a log file that captures any issues that the tool found or fixed. The log file is located here:

  • %SYSTEMROOT%LogsCBSCheckSUR.log
  • %SYSTEMROOT%LogsCBSCheckSUR.persist.log

How to fix errors that are found in the CheckSUR log file

To manually fix corruption errors that the System Update Readiness tool detects but can't fix, follow these steps:

  1. Open %SYSTEMROOT%LogsCBSCheckSUR.log.

    Note

    %SYSTEMROOT% is an environment variable that saves the folder in which Windows is installed. For example, generally the %SYSTEMROOT% folder is C:Windows.

  2. Identify the packages that the tool can't fix. For example, you may find the following in the log file:

    Summary:

    Seconds executed: 264
    Found 3 errors
    CBS MUM Missing Total Count: 3
    Unavailable repair files:

    servicingpackagesPackage_for_KB958690_sc_0~31bf3856ad364e35~amd64~~6.0.1.6.mum
    ..

    In this case, the package that is corrupted is KB958690.

  3. Download the package from Microsoft Download Center or Microsoft Update Catalog.

  4. Copy the package (.msu) to the %SYSTEMROOT%CheckSURpackages directory. By default, this directory doesn't exist and you need to create the directory.

  5. Rerun the System Update Readiness tool.

If you are a technical professional, see How to fix errors found in the CheckSUR.log for a more option on fixing errors in the CheckSUR.log.