How can I reinstall Win XP Home on computer where Win XP Pro was installed?

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  Got an old Dell computer from a friend that originally had XP Home.  Her son put XP Pro on it and now that message comes up saying it's not genuine.  I have a Dell CD with XP Home and would like to revert back to XP Home so it's legal, however I don't want to format the hard drive and lose all the other programs.  Is there any way to do a repair install or some other method to get Home back and get rid of Pro??  I have the original product key.
  
  Thanks.

  Sunday, February 7, 2010 3:46 PM