Dell 400 Xps with 37W psu

So, I bought a cheap ol' 60 buck nvidia Geforce GT 220. I removed the Geforce 6800 and it traded places with the GT 220 in electrostatic bag.

I installed the new drivers. Rebooted. Booyah. Loading up some videos, loaded up some Everquest maxed out the setting played for about 20-25 mins. Kept the game on went downstairs and game back.

The game was frozen and i moved 1 fram and then the system hung. I press the power button, on reboot I got the BSOD with message stating that Windows has stopped to prevent damage.

So, resolved this by booting safe mode. Uninstalled all NVIDIA drivers (i never uninstalled the geforce 6800 drivers the first time). Turn off antivirus, reinstalled GT 220 drivers. Reboot. Golden. I get past BSOD and log in watch Rihanna's new video to notice how Youtube doesn't flicker anymore. (Drivers are 196.21 for XP from nvidia, not the installation dvd).

Open Everquest. SSHHHRREEECCH. Everything comes screeching to a halt soon as it goes windowed mode, not even rendering any polygon's yet.

Well, after this freeze. I get BSOD With Stop Error. 0x000000000A5 or simulate. ACPI incombatible with BIOS. It proceeds to tell me to update my bios and or hardware-update.com which i can't visit in a BSOD. So...

Ultimately, my question is how do i resolve this and continue on working with this card? And/or can I support this card or must i go back to the Geforce 6800.

My comp:
Dell XPS 400
375 psu
2.8GHz Pent D
500 Gig exteral harddrive, headphones, and G15 keyboard in the usb ports.

Thanks in advance.