slim142, the 174.74 I'm using is WHQL, It supports my card 9800GX2.
Maybe it only supports this list:
WHQL certified driver for the following GPUs:
GeForce 9800 GX2
GeForce 9800 GTX
GeForce 9600 GT
GeForce 8300
GeForce 8200
GeForce 8100/NVIDIA nForce 720a
NVIDIA nForce 730a