Hard Disk Locked

hey people!
so, let me tell story haha
run mac os 10.7.2 on 8 core mac pro. while ago, tried change username, forgot 2nd user on computer has username wanted change to. changed username, didn't told it's same other one, restarted, and, well, compeltely lost access files. tried go settings , change username was, settings closed moment after opened them.
idea of can do, before throwing cash @ apple store?

 

restore last backup?

 

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