Step 2: I would suggest you to keep the computer in clean boot mode and try performing the backup then check if the issue persists.
A clean boot helps to verify if any third party application services or startup item is causing this issue.
You may refer the following KB article to set the computer in clean boot: http://support.microsoft.com/kb/929135 Note: After the trouble shooting steps, refer to Step 3
from clean boot link to set the computer back to normal start up mode.
I hope it helps. If you have any issues in future please let us know. We will be happy to help you.
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