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My dumb friend thought it would be funny to illegally upgrade me.
My friend illegally upgraded me to windows 7 ultimate as a prank, he said its "funny".
My laptop came with Windows 7 Home Premium 64 bit preinstalled and I do not have an install disc for this reason, but I do have the product key which I found on a sticker under neath my laptop battery. Any help on how to revert to Home Premium 64 bit will be greatly appreciated, thanks!