putting that dll file in the install directory thats supposed to fix both fallout 3 as well as nv checking out the directory where the INI should be (documents/MyGames/falloutnv): I have found that I was missing the fallout_default.ini -> I got the file from the internet and put it there, it still didn't work
verifying the game cache (multiple times) making a backup and restoring the game from the backup (found this as an apparent fix on the internet) Please reinstall fallout.' before going to the launcher and starting the game resulted in an instant crash. So I tried to install fallout new vegas again, I have previously installed and played the game successfully on this same machine some time ago, but when I started it up today, it showed the error message 'Unable to find INI file.