I can install and play Fallout 3 GotY and Fallout New Vegas just fine for the first time, but every successive playthrough I have to manually delete a different .ini for each game so the launcher won't crash. If I do not delete Fallout.ini for Fallout 3 GotY or FalloutPrefs.ini for New Vegas the launcher will simply crash every time I try to launch the game. Every time, without fail.
Running the Fallout 3 GotY launcher and .exe as admin or in Windows Compatibility for Service Pack 3 allows the game to run, but then Steam is disabled, no overlay, no community features, no tracking of playtime. I can verify the integrity of my local files every single time I want to play the game but that just takes too much damned time. I scoured Google and the Steam forums for a solution, tried a number of different edits and fixes, nothing worked. The only thing that gets the game and Steam running as they should i is deleting that one .ini.
Running the Fallout: New Vegas launcher and .exe as admin or in Windows Compatibility for Service Pack 3 allows the game to run and Steam to partially function, doesn't track my playtime. I just don't have the patience to run through the same battery of hacks/solutions with New Vegas that I did with Fallout 3 GotY, I didn't spend anywhere near as much time trying to find a solution for this when the most expedient solution to get the game and Steam running as they should be is to delete a different .ini.