El Problema que te ha causado esto es que en vez de descargarte los drivers de la serie 8800 te has descargado el driver especifico que solo sirve para la
9600GT.
GeForce Release 174 WHQL
Version:
174.16
Release Date:
February 21, 2008
Operating System: Windows XP, Windows XP Media Center Edition
Language: U.S. English
File Size: 36.4 MB
I have read and agree to the terms and conditions of the NVIDIA Software License Agreement.
Added support for GeForce 9600 GT GPUs.
Added new PureVideo HD features for GeForce 9600 GT:
*
Note: Users will require updated software from third-party movie players to experience the new Dual-Stream decode acceleration.
GeForce 9600 GT
Release Notes (v174.16)
Tendrias que descargarte los drivers correctos de Aqui:
Drivers 8800GTS/GTS 512Mb Windows XP 169.21 32Bits(Es el Ultimo con WHQL)
Drivers 8800GTS/GTS 512Mb Windows Vista 169.25 32Bits(Es el Ultimo con WHQL)
Drivers 8800GTS/GTS 512Mb Windows Vista 169.25 64Bits(Es el Ultimo con WHQL)
Asi se te solucionaria el Problema.
Saludos.