After seeing all return of the eternal Refresh Rate complaint, I thought I'd post a nice relevant little Detonator utility. It was posted before the horrible nV/Envy HackDeath, and I haven't seen it here since, so...
RefreshForce does all the pertinent file modifications for you. It examines your monitor, examines your hardware, and then lets you choose which settings to keep.
The homepage/download page is here.
It's a small download, you run it once, and never have to run it again. It's neither memory resident nor startup related. I like it so much, it's on my Backup CD 1, and one of the first things I install after a format.