OK you got me. What's UAC?
A throwback to Win Vista. I shut it down right away, but then I am the only person who has access to this PC.
Buzz, how new are you to Win 7? I have a lot of tips on my website about how to optimize Win 7: http://www.abithelp.com/
(General Discussion section) or I can help you here.
You also have to run both Steam and RW as Admin. I presume you have an Admin account for yourself, with a login password already. There's also performance and power settings, a whole slew of stuff you can customize!