Error message when you try to perform a backup on a Windows Vista-based computer: "0x80071A91"

When you try to perform a backup on a Windows Vista-based computer by using the Automatic File Backup feature, you receive the following error message:Note The Automatic File Backup feature is located in the Windows Backup and Restore Center under System Tools in Windows Vista.

This issue occurs if the Windows file system transaction log is corrupted. The Windows file system uses the transaction log to recover system transactions when a file error occurs.

This article helps you fix the problem. To have us fix this problem for you, go to the “Fix it for me” section. If you would rather fix this problem yourself, go to the “Let me fix it myself” section.
Note

To fix this problem automatically, click the Fix this problem link. Then click Run in the File Download dialog box, and follow the steps in this wizard.



Notes

• This wizard is temporarily in English only. However, the automatic fix also works for other language versions of Windows.
• If you are not on the computer that has the problem, you can save the automatic fix to a flash drive or to a CD, and then you can run it on the computer that has the problem.

Now go to the "Did this fix the problem?" section.

To fix this problem, follow these steps:

1. Click Start
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   , type cmd in the Start Search box, and then right-click cmd in the Programs list.
2. Click Run as administrator, and then click Continue.
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   If you are prompted for an administrator password or for confirmation, type the password, or click Allow.
3. At a command prompt, type the following command, and then press ENTER:
   fsutil resource setautoreset true c:\
   Note These steps assume that Windows is installed in the default location, on drive C. If this is not the case, adjust the drive letter of the folder path to match your configuration.
4. Restart the computer.

Now go to the "Did this fix the problem?" section.

Check whether the problem is fixed. If the problem is fixed, you are finished with this article. If the problem is not fixed, you can contact support (http://support.microsoft.com/contactus) .

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.