One of my users with a Win 7 machine has a program that he needs to use. Unfortunately it needs to be run as adminstrator. I changed the compatability settings to run the program as the administrator and provided the administrator credentials. Whenever he tries to run the program he's prompted for the adminstrator credentials which i then need to type in. Very annoying. His coworker, who is on an XP box, does not have this issue.
You could of course turn off UAC, but as I mentioned, you shouldn't turn that off, as otherwise you loose all the security features of Windows 7.