Every other NPC works fine, but the Zombieman- if I spawn a zombieman and allow it to fire a shot, the game just freezes, prevents you from using any other window, can't be closed (as I said, it breaks other windows so you can't click on Task Manager to close it), and forces you to restart your PC in order to be able to use your PC.

Is there a solution to this or do I have to buy a new laptop that isn't from 2011?

(I am F2P, and this game was gifted to me by a friend. I'll try to respond to answers, but if I don't, try your best to give as much info as possible.)