yeah i mean the VGA drivers :)
go to your programs and features list and see if you can find nvidia drivers, if it is there, go ahead and uninstall it and reboot, then install new drivers, if it's not there, then go ahead and just install new drivers.
you can grab the latest (WHQL or Beta, i actually recommend the beta) from
geforce.com directly (near top left corner).
see if that helps.