Also something to try, give build 7057 a shot as well. I found out the hard way with my benchmarking machine, that you can't use most of the vista 64-bit drivers. Many many problems. Anyway, the Windows 7 drivers work pretty darn well as is. COD 4 works like a champ with Windows 7, on stock drivers. May wanna try a clean install too. Wow, I'm gonna stop talking now....