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Windows XP Pro Activation w/o CDs or original product key?

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In that case the person who did the reinstall used illega key. There are 2 options in your case. Find another key or you have to reinstall the system with HP Windows XP (Home) install disk. You can get the ISO from a torrent site if it is lost and bunt it on a CD, hopefully the key on the box will work or the install will not ask for it as it is HP box.