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the full retail version will upgrade your system same as the upgrade version. the ones to watch out for are oem full versions, if you have a older system it will only want to full install. upgrade versions are the same as the full with one excepion, they will ask to read a previous version windows os disk while installing, if you dont have one on the drive. any windows os disk will work, 3.1, nt4, 98,2k, and ME.
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