Acrobat Pro XI error 1324 the path to My Documents or volume is invalid

Acrobat Pro XI "error 1324 the path to My Documents or volume is invalid.Please enter it again"  One of our users can only view parts of a few blueprints or opens blank page but they print fine. I can view them fine when I log into her computer. They are scans of blueprints emailed to her but they are also on the network and her co-worker can always open them fine and has same exact version.

We are running Windows 7. We only have 2 or 3 Acrobat Pro licenses so I can't download it to troubleshoot it because I don't want to mess anything else up and there aren't any available licenses I have checked differences in preferences and they are all the same.