I recently purchased a tablet PC (Fujitsu ST5011D) on ebay. In the item description, it stated that "I just installed Windows TabletXP, but it needs to be activated." Fine and dandy, valid COA on the back per auction images. Well. Upon attempting activation, I was informed that I had an "invalid product key". I downloaded and ran Magical Jellybean to get the PK from within the system itself, and i...