PCI and Onboard Video Card

My CPU: Dell Dimension L667. 667mhz, 256mb ram, 21 GB harddrive, on board Intel Corporation 810 Graphics Controller Hub (the onboard graphic card). Window 2000 Pro

I've just now reformatted my computer and installed Nvadia GeForce 2 64MB PCI Video Card. The problem is, even after I updated the driver and everything, the graphic doesn't seem to be that of the onboard graphic. <-- I recognized this from the icons of programs, they're more fuzzy and disoriented than it should be.

The Geforce is definitely put as primary device in the "display" of the control pannel. So I decided to uninstall the onboard through the system manager, but aftertime i reset the computer it keeps on coming back. How should I solve this graphic problem? oh and does refresh rate matter? I put it to 75 hertz..

 

i'm sorry i'm bumping this thread but my problem has changed so i edited the whole question. I was hoping it wouldn't get left behind..

 

Somewhere in the BIOS setup (CMOS) there should be an option to turn off (Disable) the onboard video.
Once you do that, then it won't come back, and you will be able to properly install the drivers for the GF.
If you can't disable it in BIOS, then select it's properties in Device mangler and put a tick in the box: "Disable in this hardware profile ".
75 hz is good, the higher the better, but some monitors can't handle the higher refresh rates.