I followed the guide here http://www.gamesas.com/topic/1465357-installing-fallout-3-with-windows-78-and-xp/ .

I launch the launcher, and i click the play button, and it says ""Fallout 3 does not appear to be installed and the installer could not be found. Try exploring to your DVD-ROM drive and selecting setup.exe to install the game". The game is installed, i sat for 30 minutes waiting for it to install. I put the game in a folder i made called Games. Fallout 3 is in its own seperate folder. I don't know where to go from here, please anyone help. It would be greatly appreciated!