Posted 17 October 2014 - 06:23 PM
To add to what hamluis already said.
To be able to use that XP key you would have to install the exact same version of windows that key matches. If it was Pro you install pro, if it was home, install home. Then have the key for the upgrade version of Windows 7 that was possibly installed on top of the original version of XP. So long story short you'll need the correct version of XP and the upgrade version of Windows 7 and the associated keys to each.
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