blank icon in system tray

I noticed a blank icon in my system tray. I didn't know what it was, left click, right click, double click, did nothing. Then I noticed Muse sounds were missing, all except the guitars, and there was a duplicate folder for the guitars. So I uninstalled everything, and when I restarted, the blank icon was gone. then I reinstalled musescore, and when I opened the program the blank icon came back! It stays after I close musescore, but it is gone if I restart my machine. it comes back again when I open musescore again.