Need help with Geforce 6200 and ALL Games

For some reason when I switched back to my old card and installed its the driver, my games stopped working properly. I then got the latest driver and it still isn't working. I read in the readme in Company of Heroes that I should have the latest motherboard drivers. I did just that and it still doesn't work. I specifically tried playing Ceasar 4 and Company of Heroes. This is what happens:

Company of Heroes; turn on, sound works, intro sounds normal, but just a black screen. When it's done loading the main menu, I hear the menu music. Yet I still see nothing. After clicking around I was able to start a game. I heard of course, the sound and music and people talking but still black screen.

Caesar 4; Turn on, serria intro works but still only sound and no picture. Hear cinematic sound as well but once again, no picture. Then when it's done, I see a picture! It's the loading screen. Then the main menu turns on and everything is normal. :?: :?: :?: :?: :?: :?: I can't find any troubleshooting on the internet or anywhere so I turned to here. Help!

The card before was a 1950 pro. The fan kept malfunctioning so I returned it and I'm awaiting new one. I uninstalled the driver from the card before installing the new one. I did everything properly and even uninstalled all my drivers and installed them again just in case. I used my old card to play company of heroes before getting the newer card and everything worked fine (on low settings of course). I'm extremely frustrated with this and tired. What did I do wrong?