But nforce drivers are for
a.. Audio Driver (v4.65)
b.. SMBus Driver (v4.56)
c.. SataRAID Driver (v6.67)
d.. SMU Driver (v1.14)
e.. RAIDTOOL Application (v6.63)
so all you have to do is download the GeForce driver for x86 or x64,
whichever edition of Vista you are using. Your OP refered to your video
card.