Im embarrassed :)
I remembered that after I posted this post yesterday.
And to tell that I have played Fallout2 for at least 15 times already...
(but it was a long time ago.)
I installed mod and everything was working ok except, now i cant use rifles.
I put them in the slot to use them, they are in the slot but i cant use them. There is just a picture and i cant click it. It is like when you put a picture of elvis or a plant or something like that non usable...