Huh. Win7 always found way more drivers for my stuff than XP, so guess I never ran into that snag. Type in UAC into the little run box off the start menu, and click on the resulting link, and turn it off. Next thought is, are you logged in as Admin? I'm guessing that you're just logged in as a regular user name.
Here is a good link with only 2 quick steps you have to do to login as administrator and he has pictures of the screen for each step!
http://maximumpcguides.com/windows-7...administrator/
That should solve as much of your permissions problems as possible!
Also, you can usually use Vista64bit and sometimes even XP64bit drivers on low demand hardware like a USB wireless, and it will work.