I concur with JoAnn. I think its a good idea to uninstall office 2002 IF you
are installing the full version of Office 2007. You only should keep Office
2002 if you are installing an upgrade version of 2007.
Uninstalling 2002 will remove alot, but not all registry entries and old
files that you may not need when you install 2007 as it will have its own.
Hence it could also save you disk space!
Good luck!