Friend's pc saying 'Free dos'-What does this mean?

  buel 12:00 17 May 09
Locked

Hi, my friend has just rang me to say that he has started his h.d up and gets the message 'Free dos', please can anyone tell me what this means please??

  Fruit Bat /\0/\ 12:15 17 May 09

Free DOS is an operating system.

Tell him to take out any Disks / CD / DVDs and retry.

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