MBDVD with Windows XP SP2 fails on Athlon 64

[deadbug]

I have a multiboot DVD that works perfectly well on my old Athlon XP 2600+ system. When I recently tried it on my Athlon64 box I found that it would happily start the install of Windows XP SP2 but after 30 minutes of installing when it came to the required reboot it would not restart properly (i.e. it crashed). Once I set it to not restart-on-crash (AutoReboot 0 in the registry) I could see that it was blue-screening with:

STOP:0x0000007E (0xC0000005, 0xBA3B5184, 0xBACFED3C, 0xBACFEA38)

The odd thing is that it would install Windows XP SP1 properly and from there I could manually apply SP2 (and a bunch of patches).

A quick search of the forum here didn't shed any light and this specific STOP code doesn't crop up in google (lots of 0x0000007E with 0xC0000005 but nothing if I add any of the other three addresses).

This particular disk also works perfectly when run in VMware on that same Athlon64!

Any ideas?