I recently got a new computer online. I looked at what I had in it and wasn't satisfied with the graphics card in it. I had a 64mb geforce 4. So I bought a new graphics card, ATI RADEON® 9800, put it in and started up windows xp. It then said that the card wasn't working right. I installed the program that came with it. After installing it asked if i wanted to restart my computer. I hit yes. After restarting it then said the the windows/system32/config was missing or corrupt. I tried installing XP again but after two sutdowns i had the error again. So i asked a buddy to help. He told me to format my HDD. so i did. Then i put in the XP disc and tried to install it. it keeps saying that a previouse version is on it and then it formats the drive and copies new files for setup to begin. then it restarts and i get the error, Error loading os. i tried many tips but had no success, So i hope that someone could help me.