First time using Unreal and it crashes randomly

I started Unreal v4.21 for the first time today and it seems to crash when doing random things. Using a given starter project from school and opening blueprints, building the level, even just clicking on a node and the program crashes.
The thing is, sometimes it does crash when doing these things, but sometimes it doesn’t, which makes it very frustrating to work. I can’t get any progress on my school assignments this way.

Could you be able to provide the crash log you get when this random crashes happen? Could you also please provide your system specifications?