Anyone here with good knowledge about computers?

[RedThat]

Was wondering if anyone can help, my computer has serious issues. Im suspecting it may be infected.

Its very weird how it operates. My computer plays random sounds at times. It does it by itself. There are times when I'll hear music playing in the background, or some commercial ad will come up randomly. Or, I'll hear people talking, etc. What could this be? Im dying to get rid of it, it's so frick'n annoying. There are times I want to tune into youtube, and then these stupid sounds pop up.

*any help would be appreciated. Thank you.