This Bethesda's games have so much beginner issues.
I installed fallout NV,fallout 3 and fallout 4 on my gaming machine. I couldn't start NW or 3 as it just turned off and on launcher after I press play.
Fallout 4 was working only in windowed mode. After two day of debugging and trying all kind of hacks I found out that games can't handle some Croatian letters in my username, so it created additional 2 user folders with game ini files and then couldn't decide which one to use.
Then I created new admin user on my windows with simple name, installed games and started all of them successfully.
Started playing NV just to crash after pressing new game.
Then I installed Viva New Vegas mod and game again crashed.
After that I was disabling parts of mod one by one until I got stable game.
Now I play stable NV(until I alt+tab) where all characters are bald, but that is OK, as that is what radiation do to you IRL.