Hi ,
· Are you trying to backup to an external hardrive?
· Since when are you facing this issue?
· Do you have any third party security software installed on the computer?
· Do you have multiple user account on your computer?
However, you may follow the steps below and check if it helps you fix the backup issue.
Method 1
You may access the link below and follow the steps in the article and check if it helps you fix the backup issue.
http://support.microsoft.com/kb/979281
Method 2
You may put the computer to a clean boot state andcheck if any third party applications are causing this issue.
Access the link below and follow the steps to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
http://support.microsoft.com/kb/929135
If your issue is resolved after performing Clean Boot, then follow the steps mentioned in the above KB article to narrow down the exact source.
Also in the same article, see the section on how return your computer to a Normal startup mode by following the steps under “Reset the computer to start as usual”.
Method 3
This issue may also occur if there are duplicate accounts on the computer. You may try to delete the duplicate account from registry and check if the issue can be resolved. To delete duplicate account from registry, follow the steps below:
- Click the Start button, type “regedit” (without quotation marks) in the Search box and press Enter.
- Navigate to the following registry key by expanding the "+" beside the registry tree in the left pane:
HKEY_LOCAL_MACHINE/Software/Microsoft/Windows NT/CurrentVersion/ProfileList
- Delete the duplicate profile list keys there.
- Exit the registry editor and reboot the computer to check the results.
Note: Sometimes this problem is caused by two Windows registry entries that have become corrupted. To fix the problem, you have to use Registry Editor to delete the corrupted Registry entries.
However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs.
For more information about how to back up and restore the registry, follow the steps as in the KB Article:
http://support.microsoft.com/kb/322756/
Hope this helps. Let us know the results.
Thanks and Regards,
Srinivas R
Microsoft Support.
Visit our Microsoft Answers Feedback Forum and let us know what you think.