Fallout 3 does not work after messing with mods

Hello I have Fallout 3 and it was working great but I decided to install mods using Nexus mod manager. Every time I started the game it crashed. So now I disabled all the mods and even deleted them and when I go into Fallout 3 and click new game the game says: "Fallout 3 has stopped working". What do I do?

I have deleted Steam local content 3 times now and there is nothing in my data folder related to mods.

Here's an image of what my Fallout 3 folder looks like:

Can someone please help me out and tell me how to fix my game and put it back to the way it was?

Solution 1:

Back it up somewhere and then delete C:\users\[YOU]\appdata\local\[Bethesda game name]