Why is the audio on these new compressed blueray releases so messed up?

Ok, somehow miracoulusly this bad movie appeared on my hard disk. I know, weird right? So I opened it and the audio is really messed up. You can’t really hear the actors speak but the background noise and music is uncomfartably loud. So far I had this with all movies that say 720p in the filename and are about 4.9 gygabite big. My laptop only has a stereospeaker, so I’m guessing the audio is recorded for 7 channels and I only have 2. Any tips on how to fix this?