Actually the first thing almost every single vista tip websites tells you to do is to turn off UAC. Some programs like Vue even recomnmend turning it off before attempting an install.

Thats why UAC was severly changed in windows 7.. it caused too many problems for too many people.

Here's a vista tweak guide link. The very FIRST thing they tell you to do after hardware preparation, and vista install, is turning off UAC.

http://www.pcstats.com/articleview.cfm?articleid=2238&page=5

Way too many people take way too many things way too seriously.