I just recently got a brand new radeon HD 7750 and installed it into my computer it was fine for a bit untill i installed windows 7 64 bit a few days after because my computer was windows XP. Ever since then any time a play I graphically intensive game such as ( Any Unity game flat out BSOD) ( Star Craft 2 ) (Bioshock Infintive) (Tomb raider) (NeverWinter) and more I will be greeted with a black screen for 10 seconds and then i forced to desktop with a error saying that my display driver has stopped responding and recovered. It will keep doing this anytime something Happens in the graphically intensive game. My Specs for running the games are all above par for the most part.
500W Power Supply
AMD radeon HD7750
4 gigs of ram
5 Running and non dusty fans
Windows 7 Ultimate 64 bit (upgraded to 64 bit from 32 bit XP)
Intel Motherboard DP35DP
Processor:Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (4 CPUs), ~2.4GHz
If you previously had a different video card in the system there could be a conflict between old and new drivers. I'd uninstall display drivers entirely (download the newest ones from the AMD site first,) then install those.