I have copies of MS Office 2003 and MS Office 2007 installed on my computer (Vista).
For some reason, whenever I run Office 03, then try to run Office 07, I’m told that “Office must be configured”, whereupon I wait about 2 minutes while the stupid program configures itself. It will work perfectly after that, but let me run O '03 again and the same problem recurs.
This happens on Word, Excel, and Access (sorry, not much of a Publisher or Power Point user).