Its a custom rig built in 2005 with an Abit AV8 motherboard and it doesn't have an onboard video setting that I can see in the BIOS.
I'm also using a Nvidia GeForce 6600GT video card and I have Windows Update confirm with me before installing anything...haven't installed anything new in probably a month.
I don't have a spare video card lying around so I'll try a few more things before I go out to buy one.