no boot !!!! xp sp2 auto update install



xp sp1 running fine
xp sp2 auto update, we hoped ...
installation finished ok, or so it said...
no viruses, no addware, no spyware, clean disk

next, not boot !!!!
ntosknrl loads fine, registry, drivers ok
soon after mup.sys (last driver) just before xp logo, winlogon, lsass
comes in ... boom !!! crash !!!
bsod stop 0x00000050
cd sp1 erc does not recognize the disk, so no 'r' for whatever it is worth ...
what a piece of crap software this is
any ideas ?
.


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