Basically, my computer filled up with viruses and I ended up reformatting the disk and reinstalling windows. I backed-up several games onto an External Hard-drive, then copied them back into my computer's Program Files folder after the reformat. However, running Fallout.exe, fomm.exe or FalloutLauncher.exe now results in the launcher popping up with the option to "Install" the game (no other options, such as "run") and no way to tell it that it's already installed. I would usually just reinstall the game from the disk, but I have absolutely no idea where the disk is. There is a chance that it is at my grandparents' house, in which case it will be several months before I am able to retrieve it. Help would be greatly appreciated.