I have a pc with windows xp. 1.7 GH'z 256 Mb of ram, 40 gb hd. When i boot the computer it turns on but it stays on a black screen. I tried to press F8 to go into safe mode but it wont work. I try to Re-install Windows Xp and it gives me this error message Stop:0X0000007F. i changed the memory from my other computer and i still gives me the same error message. How can i fix this? thanks for your help