PB doesn't start, gets black screen with error

Hey Guys,
When I press the power button on my PB, it starts up, but stops and a black screen comes up with an error.
/etc/master.passwd: No such file or directory
/etc/master.passwd: No such file or directory
-sh-2.05b#
It was working fine before. I was actually listening to music on it the day before. Then later that night it started moving really slow. I was downloading music through LimeWire, so perhaps I got a virus. I shut it down and the next night when I tried to use it again the error came up. From the error, I can type in commands and read up on the computer.
Can anyone help me?? I don't know what's wrong with it. Is my hard drive damaged??
- rogel

Try the instructions in this article.
(10511)

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