i got the solution bruhs :D
all u gotta do is download a pirated version of Fallout and just cancel every file except the launcher.
then create a win.rar file for the launcher to be conserved in (just in case the error/refusal to work appears again)
Hey bro I have the same problem with my game, I have tried everything and nothing works. I really need your help, please send me a message or post your fallout launcher's file. Thx!
Just so you know, the last time this thread was posted in was over 5 years ago. I doubt that person is still on the forums, but good luck.
Necroing like this is usually pretty frowned upon around here, but if you'd like to start a new thread, maybe some current people can help.