reformatted and Graphics card doesnt work?

I reformatted last night, and everything went really well until I tried to play battlefield 1942. It crashed even before I could get into the game. Then I went and reinstalled it but it still didnt work. Then I installed counter-strike, and tried to put it in open GL, but the computer said my graphics card doesnt support it, even though before i reformatted my Geforce 4 64mb 4200 graphics card with TV/out worked fine in Open GL before I reformated. I then decided just to see how it would work without Open GL, and when i went into a server for counter-strike I had a 400 ping and white lines were going across the screen ( I have a cable modem that is working fine right now). I then put a resource CD for reinstalling device drivers and using diagnostics utilities and online documentation. I did something with my graphics card, but when i shut down the computer and turned it back on, it still said that the card cant support Open GL. I then installed directX 8.1 and still nothing worked, and CS always worked with DirectX 8.1 I have no idea what is wrong, but can someone please help me, it would be great considering I have a clan match in a few days! I dont know much about computers so if you can, make the message back to me as detailed as possible. Thanks alot.