Nvidia has launched a new driver and has decided to call it 174.53 WHQL, and this driver brings a few new things. The two most significant ones are official support for the Geforce 9600GT and Geforce 9800 GX2, as well as Quad-SLI under Vista 64 and 32-bit.
This driver also brings in Pure Video HD features for the Geforce 9800 GX2. Pure Video HD can now cope with Dynamic Contrast Enhancement, Dynamic Blue, Green & Skin Tone Enhancements and Dual-Stream Decode Acceleration.
You can get it here for 32-bit Vista and here for 64-bit Vista.