[ANSWERED] I do not know how to fix this.
Fixed: All I had to do is uninstall the program and reinstall it.
I created a MuseScore account and downloaded the software.
It asks me whether or not I want to restore my last session because I did not save it (even though I did not work on anything at all).
All three options have the same outcome: the program just quits. (Yes, No, Cancel Out). This screen below pops up (notice the white box by the different menus).
Yesterday or the day before that, I tried again and Muse Score had a new update. I updated the program and restarted my computer. Musescore still doesn't work.