I'm the fix-my-computer-please around here, and got to fix a friends XP on a laptop. Nothing special, after being quick enough to read the bluescreen that was displayed for under a second before rebooting... sigh. Anyway, a simple boot from XP CD, run chkdsk, reboot and it was ok again.
But then I just had to fix it a bit more because the person that had installed XP on it didn't install proper drivers for the display. And my friend had just wondered why her computer is so slow, for about half a year or so... nice going again M$, how about fixing your bundled drivers so people don't need to hunt around for stuff.