Is there any known bug, spyware, or otherwise where the color pallette is changed without any input from the user?

I just had a user complain of the colors changing. I stopped by and everthing looked fine with the exception of the color pallette. All of the colors had changed, and the user swears he did nothing to make the change occur. This change is in effect for all workbooks.

I already went to Tools>Options>Color and tried to Reset, which did nothing?

Is there any easy fix for this short of trying to run a repair from the installation CD?


PS> It's Excel 2003 (Office 2003 Professional) on W-XP Pro SP2.