See the following MS KB
"Hardware Configuration Problem" Err Msg Starting Windows [Q314477] http://support.microsoft.com/?kbid=314477
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"Leon_Amirreza" <email@example.com> wrote in message news:%23Tu0Jv55HHA.5796@TK2MSFTNGP05.phx.gbl...
> Every Time I restart windows it won't boot up with this message:
> "ntoskernel.exe missing or corrupt"
> "Status: 0xc000000f"
> then I use Windows CD to repair the it.
> It successfully repairs windows can the next time windows successfully boots
> up for once!
> again after a restart the same message apeares and I have to repair windows
> I am using windows vista ultimate!