That's the big problem with windows If you don't have the manufacturers hardware it won't work
You have not stated what windows you have installed if it's the 32bit or 64bit system, You might get the motherboard drivers from Nvidia website here
http://www.nvidia.com/page/mobo.html.
My personal advice to you would be to move off windows all together, and install Linux 64bit operating system, It's FREE to download and you get all the 64 bit professional software that you will ever need Free, You will have no problems with drivers because they are built into the operating system
I can only inform you that Linux operating system is up todate August 2011 It's fast, stable and secure, it does not get windows Viruses, Malware, Spyware, Worms or Trojans It does not crash or freeze up,
Now you know windows is not the only operating system in the world it's up to you to check it out for yourself. Here is a list of Linux latest August 2011 64 bit version releases all work out of the box, you can check out
Linux Ultimate Edition, This has Mind blowing 3D desktop graphic
http://distrowatch.com/?newsid=06576
Linux Mint 11
http://distrowatch.com/?newsid=06695
Sabayon Linux
http://distrowatch.com/table.php?distribution=sabayon
Bodhi Linux This is like the Apple Mac Desktop
http://distrowatch.com/table.php?distribution=bodhi
if you need more info message me