During start up XP hangs showing MUP is trying to execute, instead of a blank screen.
I’m a Mac person and therefore moderately ignorant of all things XP, but isn’t the default setting to throw up a message something like “An error has occurred that requires that Windows must be restarted now” instead of showing the blue screen (with its hexcode error messages that only programmers understand)? So all occurrences of those “Windows must restart” messages are effectively BSOD also.
This is true of the Mac as well. The rainbow-colored beachball / lollipop thingie isn’t the Mac equivalent of the BSOD, that’s just an individual app locking up. The old equivalent of the blue screen was the sudden overwriting of the gui screen with bleed-through Unix text. As with XP, the modern versions of OS X have replaced that phenomenon with a “Your Mac must be restarted now, hold down the power button” error message. (In both cases these are properly called “kernel panics”, by the way).
“Unfortunately no one can be told what caused your Blue Screen of Death. You have to figure it out for yourself.”
Which seems to be a perfect close for this thread. Thanks CynicalGabe…
and thanks to all of you for contributing. 
Shut it down at will, mods.
Closed at the request of the OP.