About four weeks ago Nvidia released a WHQL driver. Now they do some perfective maintenance and offer the Geforce 175.19 for download.
The Geforce 175.19 WHQL is said to increase the performance of Nvidia's Geforce 8 and 9 series.
The Geforce 175.19 supports all graphics cards from the Geforce 6100 up to the 9800 GX2 and additionally the XP versions go down as far as the Geforce FX 5100. Of course the driver is WHQL certificated and available for the 32 Bit and 64 Bit versions of Windows Vista and Windows XP. You can find the appropriate download links below.