First question i have is the maker of your Video cards.
also need to know the maker of your Computer MotherBoard
You need to go to the maker of the Motherboard and download the latest updates....you need the New software.
ie: nvidia go to nvidea and download the newest drivers for you motherboard.
Drivers - Download NVIDIA Drivers
Just enter all your info
Product type....GeForce
product Series GeForce 8 Series
Operating System ...Windows XP
Language ...English
if all the above is the same you need this software update
Version 186.18
by the way i have Two (2) 8800 GT's made by GeForce
and my Motherboard is by nforce 780i