I have attempted to duplicate your problem and cannot. I’ve tried on three Windows 7 machines testing the speed between the Vista and XP compatibility levels with no differences in performance and duplicating the error message you have described.
I suspect that there is a problem with the installation of Office 2007 on your system which is why you are changing the compatibility level. Perhaps you should reinstall Office 2007 on your system.
Regards to All,
Martin
