I managed to fix that somehow and now I get steam error Application load error P something, there were error 5's and error 80's too, but now Its error P. First, when I started NVSE It was something like error 740, this happened if I wanted to start with FOMM too. I reinstalled Fallout NV 2 times already. Like 1 week before I had like 60 mods working and, so NVSE was working, but, becaouse of body replacer head/body mismatch I somehow fucked up the game, while tried to fix it and, then I tried to reinstall the whole game.