How can I get Windows 7 Ultimate 64bit To Recognize My Video Card (NVIDIA GeForce GTX 480)?

My PC was custom built by a friend for me. When I started it, he had Windows XP 32bit on part of the hard drive and 64bit Win XP Professional on the other. I installed Windows 7 64 bit Ultimate on the part with the 64bit Win XP and everything was running great. I tried to run some programs today and then realized that my video card was not recognized by Windows 7 but was on the 32bit XP rather. How can I get it to work with the Win7? Please please help.|||U just have to download the Nvidia geforce gtx 480 drivers from Nvidia.com but u have to chose for win 7! install restart and enjoy! I hope it helps