sp3 BSOD

hi yol
i just upgraded from sp2 to sp3 and my system is unable to boot to
desktop.after the windows logo a BSOD appears ...............c
0000218.....registry file failure..............the registry could not
load the
hive(file)...........systemroot\system32\config\software..................then
it starts to dump my physical memory. after which it restarts again and
the cycle continues. the other thing is am able to boot to safe mode
without hustle. i really dont know what to do bout it so i was
thinking bout downgrading back to sp2, cos i didnt uninstall it
before upgrading to sp3

.

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