So, my girlfriend’s PC crashed, as sometimes happens. Now, though, when she attempts to re-boot, it gets as far as the ‘Windows was shut down inappropriately’ (or something) screen, which offers choices such as booting to safe mode, booting normally, restoring last working configuration and so on. Except that, when one of the options is chosen (any of 'em), it immediately re-boots again. And so on.
Now, my best guess as to what the problem is was ‘probably something with the hard drive’, so I took it out, connected it to my PC, and ran some tests (using SeaTools) which all came up clear.
Any guesses as to the likely cause? Is the Master Boot Record shot? (The system is WinXP, by the way, and the drive is NTFS formatted.) What do I have to worry about trying to rebuilt the MBR via the recovery console and fixmbr?