Lost settings

Abimor

So I logged in yesterday and I had to pick the brightness of the screen agree to all of their terms and tell them I play in the US again. it lost all of my mod settings too. The mods still worked I just had to go back through them all and set them up how I had them. Has anyone had this happen before? How can I avoid it? is there a file somewhere that I can copy in case this happens again? Thanks for any help.