Hi, I have upgraded a Compaq Presario SR1080UK XP edition to Win 7 and increased the RAM to 2 GB. I tried to play Chess Titans and found I could only get a basic version (no 3D ) and guessed this would down to the games card. I replaced the old card with a Radeon HD 4650 1GB DDR2 and on rebbot the card was recognised. However on restart the computer would not start properly. I have now put the old card back and everything is as it was before. Can anyone tell me if the new card is the correct one and if so have I followed the right procedures - if not can you please tell me what to do. Thank you in advance.