Good day everyone this is my first post here so i wanted some assistance from anybody my laptop came with windows xp home and it was going well until my hard drive was sent for an exchange to a new one when i received it back i saw the message saying that my version of microsoft windows is no longer genuine and the technician installed windows professional instead . my laptop did not came with a cd so i am rather in a fix and due to my carelessness i can only see the last 15 letters on the coa . So i am asking if anyone has any ideas for me in what to do as i would be truly thankful . Many Regards and sorry for the long post