my pc will boot up and then it displays

  gerry34 22:17 11 Apr 2006
Locked

when i turn on my pc it displays "no operatins system". although i have been using it perfectly well running windows xp pro. someone told me i may have a corrupt or missing, something or other file, because when i actualy turn it on i press f1 and it shows the operating system is there ,
i cannot get into f8 or anything like that,
can someone help me , or can i download this necessary file from somewhere or do i have to reinstall windows xp pro fully. look forward to any replies

  VoG II 22:19 11 Apr 2006

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