You receive a "0x80070490" error code when you use Windows Update or Microsoft Update Web sites to install updates

When you try to connect to the Windows Update Web site or to the Microsoft Update Web site, you may receive the following error code:

This issue may occur if there is corruption in the Component Based Servicing (CBS) manifest.

To resolve the issue, follow the steps that are appropriate for your operating system.

Windows 7, Windows Server 2008 R2, Windows Vista and Windows Server 2008

To resolve this issue follow the steps in method 1. If method 1 does not resolve the issue, continue to method 2.

Method 1: run the System Update Readiness tool (Checksur.exe)

1. Download and run the System Update Readiness tool. This tool runs a one-time scan for inconsistencies that may prevent future servicing operations.
   
   For more informationabout how to download and run the Checksur.exe tool, click the following article number to view the article in the Microsoft Knowledge Base: 947821  (http://support.microsoft.com/kb/947821/ ) Description of the System Update Readiness Tool for Windows Vista, for Windows Server 2008, for Windows 7, and for Windows Server 2008 R2
2. Try to install updates again.

Note After you run the tool, the Checksur.log file is saved in the following location: %systemroot%\Logs\CBS

In a default installation of Windows, %systemroot% represents the Windows directory.

If this method does not resolve the issue, go to Method 2.

Method 2: perform a repair installation of Windows

If method 1 does not resolve this issue, you must perform a repair installation of Windows Vista, Windows Server 2008, Windows 7 or Windows Server 2008 R2. Performing a repair installation will restore the current Windows installation to the version of the installation DVD. This also requires the installation of all updates that are not included on the installation DVD.

Note Performing a repair installation will not damage files and applications that are currently installed on your computer.

To perform a repair instalation of Windows 7, Windows Server 2008 R2, Windows Vista or Windows Server 2008, follow these steps:

1. Close all the running applications .
2. Insert the Windows Vista, Windows Server 2008, Windows 7 or Windows Server 2008 R2 DVD in the computer's DVD drive.
3. In the Setup window, click Install Now.
   
   Note If Windows does not automatically detect the DVD, follow these steps:
   1. Click Start
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      , and then type Drive:\setup.exe in the Start Search box.
      
      Note The Drive placeholder is the drive letter of the computer's DVD drive.
   2. In the Programs list, click Setup.exe.
   3. In the Setup window, click Install Now.
4. Click Go online to obtain the latest updates for installation (recommended).
5. Type the CD key if you are prompted to do this.
6. Select the operating system in "Install Windows" page you want to Upgrade or Inplace.
7. Click Yes to accept the Microsoft Software License Terms.
8. On the Which type of installation do you want? screen, click Upgrade.
9. When the installation is complete, restart your computer, and then try to install the updates.

Windows XP, Windows Server 2003, and Windows 2000

To resolve this issue, use the System File Checker to verify that the correct versions of the system files are present. To do this, follow these steps:

1. Click Start, and then click Run.
2. Copy and then paste (or type) the following command in the Open box, and then press ENTER:
   cmd
3. At the command prompt, type sfc /scannow, and then press ENTER.
   
   Note If you are prompted for your Windows XP CD, insert the CD into the CD drive.
4. After the System File Checker has finished, try to install updates again.

For more information about the System File Checker, click the following article number to view the article in the Microsoft Knowledge Base: If the System File Checker does not resolve the issue, you must perform a repair installation of Windows XP.

For more information about how to perform a repair installation of Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:
After the repair installation is complete, try to install the updates again.

Note Performing a repair installation will not damage files and applications that are currently installed on your computer.