Well yeah although your data seems in error.
The LV4XA2 is a Pentium 4 mainboard, yet you're using an AMD XP processor. How can this be? Here's a link to your mainboards website:
http://www.ecsusa.com/products/l4vxa2.htmlThings to look for: memory - is it clocked properly and are you running DDR400? Re-install the latest Via Hyperion drivers as it may be your Gart driver is now fubar. (That's the driver that tells your video card how to talk to your memory).
Surf over to Nvidia's website and find the uninstall instructions and follow them to the tee. I believe they'll recommend a driver cleaner program that you can use. Start all over from the beginning, take out ALL the old then put in the new vid drivers followed by the Hyperion driver.
Look over your bios and make sure it's all up to snuff - that AGP8x is enabled, that sort of stuff.
In short - your videocard is starving for more memory bandwidth.