does the card show up in the windows device manager?
control panel-> system -> device manager
if it does, or even if "standard VGA adapter shows up" right click on them click uninstall, then click the box in device manager that says "Scan for plug and play compliant hardware" then it should find it.
Once it shows up in device manager right click again and click "properties" then click update driver. point it to the location where the nvidia drivers are extracted. I guess before you do this you should open the latest nvidia drivers so it extracts the files somewhere, usually c:\nvidia
Hope that helps.