AVI IN PREMIERE PRO CC 2017?!

Guys, i need some explanations.

So what happened to me was very strange.

I startet some days ago with premiere pro. I have a simple camcorder wich only records in AVI.

What i did with premiere was what i wanted to do - i imported the AVi files (you heard that right), edited them and rendered a video.

So far so good. The next day i did the same. Until.. I changed something, i dont know exactly what, but to boost the performance on a video game, i changed some settings in my NVIDIA. The result was, that i just was not able any more to use AVI in premiere pro. Well, as i had to notice on my search for an answer, this is nothing to solve, because premiere simply cant do AVI. What the heck? The whole internet told me that. Forget about avi, you have to convert the video file to some mp4 or whatever. But my problem is a strange one. I was frickin able to use AVI! But it seemed that i was the only person on earth with that ability.

So yeah. I reinstalled CUDA and premiere pro and media encoder. Nothing worked, even though everything should be the same again.

I need help..