xp logs on then off again instantly

  TUCKY 20:32 07 Nov 06
Locked

I have just installed xp service pack 2 on a Time pc with xp installed.
I ran windows update and it installed 63 updates and internet explorer 7 .
When I rebooted it went to the normal log on screen , but when I logged on it instantly logged me off again so I rebooted in safe mode only to find the same problem.
Obviously the updates have caused the problem but I cannot get to my desktop to uninstall them.
Can anyone help me without having to do a complete reinstall

  Graham. 20:52 07 Nov 06

Tap F8 at boot and pick an option.

  TUCKY 18:19 08 Nov 06

thanks Graham I've tried that but safe mode does n't let me on to the desktop as it also logs me straight off again

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