Hi, I'm sorry to be going over old ground with this thread but none of the previous ones have covered this exactly. At start up I get the following message: "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 don't have an XP system disc. System restore doesn't work. All diagnostic tests come back clear apart from occasionally I get an error message saying there is no keyboard attached. I have tried using a USB and Ps2 keyboard. I have a copy of the corrupt file on cd, but cannot get my PC to even start in Safe mode with the command prompt to copy the file over. If this is the end of the line for this OS, is there a way I can retrieve my data from the HD? Many thanks in advance for any help you can offer!