Outlook 2007 unable to open attachments

I have a user running Windows XP Pro, sp3 with Outlook 2007. All has been
well. Yesterday she updated her Adobe Reader to v. 9.3 (not sure if that is
relevant but pretty suspicous). Now when she receives and email with a .xls
attachment she is unable to open it. She gets the message:
C:\Documents and Settings\username\Local Settings\Temporary Internet
Files\Content.Outlook\F2E0M??\filename.xls could not be found. Check the
spelling of the file name, and verify that the file location is correct.
I thought perhaps the security folder under Content.Outlook was full, kind
of like the OLK#### folder in Outlook 2003 but I don't see any files in it.
You can save the attachment to the desktop and Excel will open it from there
but not the attachment in the email.
Any help would be appreciated.

Thank you,
--
Mike Stevens