Had a problem with a missing file on this PC, which is running XP. Lot of rubbish on it so I decided to format something i have done many times. This PC turns it's self on and off, when it is running and you touch the mouse it reboots. I did manage to reformat, and left it on all night whilst trying to recover some lost data. All that is on the PC is XP, and a recovery program, again it cuts out, and is now coming up with a message syaing NTLDR is missing, so I need help here please because I don't know what is happening.