Well these are all very interesting solutions, but I downloaded the installer and had it extract to a dummy folder. I then zipped up said folder and placed it here for you, kenovo: http://www.valikorlia.com/Graal.zip

Extract that folder anywhere you like and give it a run. Graal is actually a very simple program for the PC, I don't think your issue has much to do with registry or multiple installations of Graal.