Is my computer infected or nah? I am wondering what makes these Music Manager advertisements appear on my screen. I am 100% sure that I did not install any program called Music Manager on my PC.

These ads appear at random times (I mean, sometimes it seems that my mouse clicks trigger them, but sometimes they just appear although I just watch a video on Youtube or so). I suspect that my PC is infected, but I am not sure. What can you say about it?