I am unable to install my Photoshop CS6 upgrade because the upgrade does not recognize a qualifying product on my system. When asked, I enter my current Photoshop CS3 Extended serial number, but the upgrade does not recognize it as a valid serial number from a qualifying product. I have tried to do a clean install to make sure no other applications were running or in conflict. My operating system is Windows XP Media Center Edition 2005, Service Pack 3. I have an Intel Core 2, Quad CPU @2.66 GHz with 4GB RAM.
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