Sajtrex

hello everyone i have found myself in a bit of a dificult situation, i am new to moding in general and i have tried to dowload enb to the game it work, but then it sudenly stoped working, the game starts normaly and if i alt+tab out it goes into the main menu but when i get back into the game it crashes, i am at the point where i completly unistalld fallout 4 and it still doesnt work, if somebody know how to fix this i would be greatful if you could help.