Troubleshoot:cannot back up on external HD. error 0x80070020

cannot back up on external HD. error 0x80070020

sceen message-process cannot access the file because it is being used by another process.
i can back up if i disable the App Data file.

Anwsers to the Problem cannot back up on external HD. error 0x80070020

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To check for Windows updates. Open Windows Update by clicking the Start button , clicking All Programs, and then clicking Windows Update. In the left pane, click Check for updates, and then wait while Windows looks for the latest updates for your computer. If any updates are found, click Install updates.

Install the latest updates for Windows and for the program displaying the error. Note that the update for the program might be listed as an optional update on the Windows Update page.

Open Windows Update by clicking the Start button Picture of the Start button. In the search box, type Update, and then, in the list of results, click Windows Update.

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