No problems here either, been running Win7 64 bit since RC.
You can get it working without disabling UAC though, I only lowered it a notch to make it stop alerting me when I made changes myself.
The biggest issues running with UAC enabled is the fact that you are running 3 separate applications from launch to play.
I would advice you to try getting it up and running with UAC enabled if possible, but that's just me