Possibly infected by a RAT (Remote Access Tool)? - Read!

I dont watch pr0n, so no nothing has been downloaded except rune2006 client. And i have malwarebytes and windows defender, also. My youtube layout has changed. Idk how to screen shot it or i would. But my youtube format is the same except for the video client itself, the client shows a grey bar that is unattached to the youtube video as my timeline, the video isn't centered and you can see black space and theres a youtube watermark in the bottom right.