If you have ever faced the situation of wanting your sound icon to disappear from your Power Point presentations, then you will find value in this information.
Due to the clever programming systems in place these days, most of the things done in IT are object-oriented. In this case, you can drag items from your screen quite easily: Just click on the sound icon and drag it to the edge of the screen where the slide is. This will suppress its image when it comes to both .pptx and .wmv presentations, so that you won't see the icon in both cases (movie and slides).
You could also go to the right rectangle of your screen, where you see the list of extra elements on your slide (if you have it on) and right click on the arrow. In this case, you will see the option Hide the Icon. Just tick that box. If that doesn't work, you can reinstall your Power Point. Notwithstanding, you may be a victim of hacking and malware, so that reinstalling the program won't work. You should then run good anti-hacking and malware programs over your version of Power Point.