Well, I'm afraid I might not be able to help much. I grabbed it and it installed fine. When I double clicked the .exe UAC popped up and I clicked yes, then the installer did it's thing. Does the same thing as DA version and installs to totalgaming folder instead of Twilight/Mods, but otherwise went normally. Been awhile since using AVG, but maybe it is denying it access to make changes if it still believes it infected(Scanned clean on mine with Avira BTW)or maybe even something UAC related. Sorry I couldn't be of more help.