TF2 Crashing

Well, for some reason TF2 keeps crashing, Other source games seem to run fine, along with WoW and ST IV, STALKER:CS to name a few. It ran fine for around 8 months

My specs are as followed:
C2D e8400
2gb Corsair Dominator 1066mhz
EVGA 750i FTW
x2 160 WD in Raid 0
PNY 8800gt
Thermal take 850w

Running TF2 on high settings, no motion blur no AA and x2 AF, 1400x900 in windowed mode.


Temps don't seem to be the problem, my CPU is at around 46c load, my 8800gt hits about 66c load. When it crashes it seems to get artifacts or visual errors, like splices in the screen or as if someone shattered the monitor, no BSOD and it freezes the entire computer.
Also Reformatted computer, and still same error
I'm running in the background a few web pages, Utorrent (throttled to give bandwidth to games) Steam, and Magic Disc.

Any help or suggestions would be awesome, cause I'm sure out of Ideas