I have installed Nvidia Geforce 2 ti 64mb card, did a clean install but 3d games always hang my system after about 2-3 mins of gameplay. I've already tried to change my bios settings, change driver (2185, 2188, 2890, 3140) but no result. Sometimes the system even hang when I'm surfing the internet.

Bios V4.51PG
Winbond B29C020C-90B
09/21/1999-693-596B-8671-2A6LGV3DC-00
Chipset VIA VT82C596B
MB 440BX/ZX/VIA@ VT82C693/693A
Pentium 3-700 (Slot 1)
Win 98SE
128MB Memory
1 AGP slot (VER 2.0, 1x/2x mode supported)
20GB Harddisk
power 250watts
nvidia tnt2 m64
Directx 8.1
I've since taken out the card and put back my old tnt2 card.
Pls help. Thanks.