Did you go from Vista to Win7?
How good/bad was it?
Did you have to reload all your applications? Photoshop, LR, etc.?
LR 2.5, Windows 7 Pro 64, ATI Radeon HD 3400, Single Display (Viewsonic VP2250), 3GB RAM
Not having this issue at all. I have all the ATI applications - Control Center, etc. - turned off. LR hasn't liked these display apps in the past. Has to be a display adapter issue or setting IMO.
Windows 7 Pro 64 was an easy upgrade from Vista Pro 64. Had to reinstall Color Eyes Display Pro, and a couple of others. Firefox seems to crash once and a while, but I tolerate it since its color managed.