Help ! ,can't finish 3dmark2001anymore .

Hi , i hawe a problem here , my system will not finish 3DMARK 2001 and he jump out of games after 5 minn play .
I never had this problem before , i reset all PCI , Memory , Videocards , i reinstall XP but i hawe the same problem , it will not lockup but only quit the 3d application .

8K7A , XP Pro 0S ( SSE enabled )
XP 1800 / SK6
Leadtek Geforce 3
Nic 10/100 Dlink 530TX
512 Crucial DDR PC 2100
Soundcard Fortissimo Maxisound Hercules
60 GB Maxtor 7200
Antec SX1040 B , PP 412 X 400W PSU .
Liteon 40X CDRW
Toshiba 12X dvd

I run XP Pro , Nvidia 29.42 Oficial driver , no IRQ conflicts