A close friend has an unlicensed copy of XP Pro on his PC. Because of
that he is unable to download & install Microsoft Security Essentials.

He wants to get a licensed, legal copy of XP Pro on his PC. I know
where to buy a sealed copy of XP Pro. I need to know how (if
possible) how to install the legal, licensed copy of XP without losing
all his data - that is without reformatting his hard drive. Is this
possible?

David