While its a tad (3000 miles) far for me, I can tell you that if they are getting BSOD directly at boot, and cannot boot into safe mode....there is only one solution:
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Boot from floppy or windows install disk
Reinstall windows
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If you can get into safe mode, reinstalling windows is the only sure way, and certainly the easiest (as in, you'll pull out less of your hair) way.
If after reinstall, you still get BSOD, or if you cannot get floppy/cd boot to work (it hangs up or whatever) it very likely a hardware issue....start with RAM, then video card....anything further and you are getting into the realm of "I gotta be there" to fix it territory.
hope this helps