Vista - software and games on Vistax64

I'm using vista business x64 for two years and have no problems with it, I mean with software. I use adobe products like dreamveawer, fireworks,photoshop then vmware workstation,EMS SQL MANAGER. These programs work fine, no crushes, fast. Emule dont work in vistax64 and winamp shows some internal errors. The only problem is that i cannot play any games. I tried COD4, Counter Strike,Mediaval Total WAR and none of these games installed sucessfully. Is there some solution for gaming on vista x64.

What's your experience

what kind of specs do you have? does it bsod on you, or just say it failed to install?

I can't remember others but i remember COD4. I have installed it with directx and when i run game nothning happened. I take a look in my taks manager and saw not reponding

Do you have a dedicated GPU (Graphic Processing Unit)?

It runs without problem on my x64 system. If you check my specs, I have a Sapphire 4850 (512Mb RAM) and the game soars at the highest levels. I don't mean to rub it in! I just reckon it must be a graphic card issue...onboard graphics is unsatisfactory for DirectX games IMO.