My account on my computer just disappeared. How do I get it back, or at least get the files back?

What happened was that I created another account on my computer. So now there were two accounts. I started up my computer and my account has just disappeared. I believe it's hidden because the memory is the same. What do I do?
My account on my computer just disappeared. How do I get it back, or at least get the files back?
i have the same problem contacted yahoo and they told me there was never an account for my e mail address after using same for over two months. I did however see some viruses in the account.yahoo stated that after 48 hours of none use the account would be active after that time period no such luck all was lost
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