This will help if you installed a wrong driver
TechPowerUp,
OSSupport:Windows 2K/XP/Vista Size:407 KB
* Fixed SLI detection for Vista32 and Vista64 * Added automatic refresh of clocks and multi GPU status * Added support for NVIDIA Quadro FX Go1400, Quadro NVS 440, GeForce 7350 KE, 7300 GT, 8400 SE, 9800 GX2, 9800 GTX, 9500 GT, 8400, Quadro NVS 140M, 135M, FX 360M, 9300M G, 9500M GS, 8600M GT, 8700M GT, FX 3600M * Added support for G96 * Added support for ATI FireGL V8600, some RV635 and RV620 variants * Fixed fan speed monitoring for RV6xx * Fixed fillrate for 8800 GTS 512 * Fixed some subvendor names * Fixed shader calculation for M68 * Process size, Die size, DirectX Support will now show Unknown * Fixed crash when no sensors detected * Fixed NV44 ROP and shader calculation * Fixed crash when NVIDIA BIOS couldnt be read * Added Splash screenGPU-Z is a lightweight utility designed to give you all information about your video card and GPU
GPU-Z,
Try to set a system restore point before installing a device driver
TechPowerUp,
Do not forget to check with our site as often as possible in order to stay updated on the latest drivers, software and games
GPU-Z,
Main Features * Support NVIDIA and ATI cards * Displays adapter, GPU and display information * Displays overclock, default clocks and 3D clocks (if available) * Validation of results * No installation required * Support for Windows 2000 / XP / Vista (both 32 and 64 bit versions are supported)It is highly recommended to always use the most recent driver version available
TechPowerUp,
Problems can arise when your hardware device is too old or not supported any longer
GPU-Z,