Mac won't start properly afer upgrade to 10.5.1 - Hangs on spinning ball

Hi, please help !
After upgraing to 10.5.1, It hangs on loading finder... og takes an awful lot of time starting (4 hours and counting)
I get a messagebox telling me that OS X has rebooted improperly, and do I want to report or Ignore. Neither of these works.
What can I do now, I can start applications from the dock, but these also hang after loading.
HEEELPP!

Thanks for your answer, but I managed to get this sorted in this way :
Reset Pmemory.
Started the machine holding the left-shift button down, I guess I entered single user mode.
Reinstalled the complete update from a USB mem-stick, containing the complete update, and not the small, that came with system-update.
After this, all is well.
Thanks for your answer anyway, they migth save my bacon the next time..

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Mac won't start properly afer upgrade to 10.5.1 - Hangs on spinning ball

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