Why is my engine crashing?

I have been working on a project for school, and everything is so far is just following instructions. Which means there are 25 other people in the class with the same exact computers and same exact version as me. So why is my UE4 crashing?

It only crashes when I select the GameMode, Animation for the character, the Character BP or the Player BP.

I have no idea what to do because the instructor will not give extra time for engine failures. Can anyone tell me why UE4 is crashing?

It crashes (does not show any bug report) and sometimes it will even crash my computer completely. So do I need to install again?

Please anyone, give me some help on this, it makes no sense. If it was an issue with those 4 things listed above, it would be awesome to actually look at those files and see what it wrong with them, but I cant even right click on them without it crashing. I have already completely restarted the project from scratch 4 times, and this always happens.