Go into the program files and remove the lavasoft folder or ask one of the boys on the lavasoft forum they usually know all there is to know about ad-aware btw it works on my vista lol and yes you have to remove the old version 1st as glen says ,it is compatible with vista ( although vista isn't compatible with much lmao ), mine came in a nice box which is the best thing about it, ( my daughters hamster loves it , and he dont know jack s... about pc's), old Bill should of got the box designers to design vista , mine came with a game for making cakes which had a copyright on it , to funny , my 3yr old did that in 5 mins and hammy ( her hamster did it in 10 ), me thinks vista was designed by monty python as a spoof lol.