I don't know for sure...

...but it seems all of you having trouble are using winxp.

I had similar problems with my 235 W power. I changed it to 300 W and now no probs

Well all i can say is that i also have the problem but then in 3dmark2001SE with Dragothic@high , all the games i play work fine though. :o
i am running Win2Kp for now on a XP1800 , ASUS A7V333 , 256 DDR333 , ASUS Ti8460 Ultra with 350w PSU

8) As I sit here and read about people bad mouthing GF4ti4600 video cards,you would think that maybe it could be your computer that has the
problem!!?? Most of the time it's people with lousy mother boards,they go
and spend $400+ bucks for a video card and neglect their mother boards.
You can buy a new m/b for $150 or less, buy a 4200 or 4400 video card,&
theirs your $400 bucks spent wisely........ Think before you upgrade!!

try increasing the voltage to your agp, which on most mobo's CAN NOT be done in the bios, but with a jumper located with 4 pins. also, for asus mb owners, look into manually configuring your agp str value, asus is pretty crappy when it comes to doing that with the auto feature.

Heres a fix I used. I still have problems when I run my Sb Live card with the Abit GF4 ti4400. Must be conflicts with it, or power drainage on my PCI slots. I cannot change my AGP voltage how u do that on the vid card? Is there a site that shows u? I have a 400 watt powersupply, so maybe the mobo just cant handel the power useage of the AGP. I got a KG7-Raid mobo.

Per Lazarus :

1. Download NVcleaner from here http://www.guru3d.com/files/ and the driver you are going to use, Nvidia just released a WHQL certified driver today ver. 29.42
2. Boot into safe mode, F8
3. Uninstall the VGA adapter, any and all, dont worry, on next boot it will force XP to install the card that's there. Reboot
When you reboot cancel out of the hardware wizard, do not install or let windows install the drivers.
4. Open Nvcleaner and hit Clean, hit okay, you will see an error page "could not delete these files, don't worry, your not worried about cleaning the C:/windows files, you just cleaned your registry.
5.Right click my computer/Hardware/Device Manager, you should see the VGA adapter with the exclamation!, update the driver to the new one, VGA Adapter/Have Disk/Location of driver. Word of note: dont worry about not seeing the GF4 card in the window that has a list of video cards, don't double click on any of them, just hit have disk... reboot
6. Go into bios AGP Aperture set to 256, disable fastwrites to be safe until you think your stable, then test it out.

If nothing else now you know how to do a clean driver install , but hopefully your registry is just clutterd with NV files and this will clean them out, in turn not creating any conflicts between XP and the AGP adapter.......