Hi Guys, I am running Windows Xp upgrade installed over '98'. I ran a system restore to try and retrieve a file I had deleted. Seemed to go fine so I turned my computer off in the correct way. I tried to start my computer about 1hr later and instead got:-"Windows could not start because the following file is missing or corrupt. <windows root>\system32\ntoskrnl.exe. Please re-install a copy of the above file. I have tried to put the Windows Xp upgrade disk in, nothing happens. The only thing I can get into is my setup by pressing DEL on start up. Any ideas Guys. Thanks in advance. Heybob.