MAC OS X Setup Resgistration again??

I was getting a start up disk full message even when I had about 40GB available. But now when I turn on my laptop, I'm getting the MAC OS registration screen. Does this mean I lost all the document on HD. Please let me know if I should register.
Thanks

Try this link to boot up in safe boot
Safe Boot
http://support.apple.com/kb/HT1455
When you get to the log in screen restart the machine without logging in.
If that does not work then try this link
Disk Utility
http://docs.info.apple.com/article.html?artnum=302672

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