When i upgraded to Lion, it deleted my main user account and only left my guest account, how can i fix this?

My main user account was deleted, and only my guest account remained. I don't know my password for the guest account anymore, so i couldn't log in, i had to use my time machine to restore to the day before when i was on 10.6.7. How do i fix this?

I've stumbled upon the solution to get back into our machines.
At the login screen, when presented with 'guest account' only, do the following:
tap enter while holding down 'control' + 'option' + 'command'
...you should be reunited with your usual login personalities.
Happy days!

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When i upgraded to Lion, it deleted my main user account and only left my guest account, how can i fix this?

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