I am trying to upgrade from VW10.5 to 12 (on Win XP + sp2). My supplier, for some reason, decided that I need a new dongle. With the result that VW12 is now non-operable. It rejects the new dongle and insists on the serial number of version 10 and the older dongle. But rejects also them, ofcourse. I even have uninstalled version 10.5 and cleaned the registers. Yet, the message prevails - "the dongle does not match the serial number...". After five installation attempts I am starting to wonder who invented the dongle and why... Earlier versions of VW have installed one after another with no problems. The PC is very normal in setup and used mainly for VW.