:^0
What you need to do is turn off the
intergrated VGA video in the CMOS. You
probably need to hit the "DELETE" button
while your computer starts up but depending
on the manufacturer it might be a different
button like F8. The instructions are
probably flashed at you every time you
restart along with a version # & "AMI BIOS"
or "Phoenix - AWARD BIOS". Either way, if
you press the right button before the
Windows bootloader NTLDR.EXE takes over,
you can change a lot of basic settings for
your hardware, like IRQ & onboard video.
If you don't know what an IRQ is, don't
mess with it! Just don't change anything
in the BIOS except to turn the onboard VGA
from "ON" to "OFF" & you'll be fine. Press
the 10th "function" key (F10) when you've
made the change, then "Y", and your new
video card should work.