Macbook software update reboots then acts like its never been used before!!

HELP - perfectly working Macbook 10.5.1 - did software update, computer rebooted, and then presented me with the create account/register screens that you would get if you just bought the thing or reloaded the OS.
Any ideas what happened and how to go back? I don't want to create any new user accounts and overwrite anything!

I booted in safe mode and was able to see my accounts, but logging into either of them took me back to the registration loop.
I decided to restore from TM backup from 6pm last night. I think the issue was caused because I had a couple of crashed programs and did the system update- somehow it messed something up.

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