I am a simple user as you are, and I agree with you that it shouldn’t make any problems. I am only posting what I am seeing these days that is happening to others and how they finally solved the booting / shut down problems.

Try avoiding going back to restore points, as much as you can. Most posts here about them are not solving almost anything.

A repair of Avast might solve the problem in some cases, instead of a full uninstall and reinstall.

Rebooting after changes / troubleshooting / installations seems to be more critical than users tend to think. Again, this is just from recent (and older) posts, after the recent new stable version of Avast was released.

If you try these procedures and all them fail, please don’t hesitate to ask again for more help.