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I'm getting this error dialog whenever I try to back up and I have no idea what to do about it:

[Window Title] Windows Backup: Troubleshooting Options

[Main Instruction] Check your backup

[Content] Windows Backup failed while determining libraries location of one of the users included in backup.

Details: BitLocker Drive Encryption cannot be used because critical BitLocker system files are missing or corrupted. Use Windows Startup Repair to restore these files to your computer.

Error code: 0x81000031

Update: I finally managed to back up some files after a long time. I'm not sure which of the following steps are necessary, but I deleted all existing back-up files, including the system image and then I unselected all the "Libraries" virtual folders and just selected my user folder under C:\Users\.

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Are you using BitLocker to encrypt a folder? Perhaps the Windows 7 backup has no access to these files which blcoks the backup from working

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As far as I can tell, I'm not using BitLocker for anything. –  Mark Cidade Jul 17 '09 at 5:29
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