and make sure you're getting your memory in My Computer (right click and go to properties and see if it says 2.3 gigs).
If that doesn't work try reseating it. Open up your box and pull out your video card and put it back in nice and firm (not breaking anything).
My brother had his computer serviced and all of a sudden he lost cdrom drive. I looked at it and they bent one of the pins on the back of cd rom drive for the ide connector.
I just got my rig back from my computer place, where they upgraded my 1GB of RAM to 2.3GBs. It seems that something is wrong with my card. Whenever I try to watch a movie, I get no image, just sound, and when I try to play any game, it freezes on the starting screen. Everything else, however, is fine.
I just downloaded the new drivers for my GeForce 7950 GTX, didn't help. I'm on a Windows XP system.