Ok i will try to explain all this in one go. i have microsoft flight sim 2004 just installed, The problem been is that after so long say 1, 2 mins it just locks up and i have to restart my computer from the restart button. In this game, it gives you a diagnostic tool wich allows you to boot the game in safe mode and play it, to see if there is a hardware fault, I did this and it didnt freeze or hang. But as soon i i start it the proper way its back to it hanging and freezing. So this is suggesting that i have a hardware fault. What does anyone think can be the problem, I run other games and dont have this problem, my card is a Geforce Fx 5900 and i have all the latest driver and direct x installed. My OS Is XP Home with service pack 2 and i have 512 ddr Amd 2500 processer.