Computer restarts with 7600GT

Hi,

I purchased a Club 3D 7600GT AGP ago by less than one year, and it seems that I had no problems so far (except for some occasional reboot), though I was playing to the PC without a good time.

Now I bought a new monitor 20 'pan and when I try to play FEAR I restarted, the same thing when I have 1 minute to play Far Cry, and even I have been watching some past videos.

The pc is this (Fujitsu-Siemens SCALE 600 with the source, graphics and ram changed):
Pentium 4 @ 2.5 Ghz (19x133)
1024 MB Ram PC3200 DDR 400 (although going by the board at 200 Mhz)
Source Tacens Radix Smart 410W
Plate MSI 645E chipset Max2 SiS 645DX
Monitor Asus PW201

It is that if something like because of the graphic card.

Let's see if I can lend a hand, with my old card that could throw some items even if slow, now I can not begin to play.

hi,

I see you have AGP, so the first step would be to disable Fast Write that.