Tried running it without Galaxy? Or running Galaxy without Crusaders?

Sorry for the late reply, but, yes, I have. I accidentally clicked on the start menu icon when I was trying to open another program, and, like clockwork, it shutdown the router. GOG Galaxy wasn't on at this time, the game was opened directly. Also, I have CoMaM blocked in my computer's firewall. I know it's the router going out because both my dad and I are unable to get on the internet after this occurs.

This is really weird.

What exactly happens to your router (and how do you "start" it again after this happens)?

You might want to repost this in General Discussion. This game's subforum is pretty dead, but someone might have come across this in another game.

I will.

Basically what happens is when I try to run this game (or UT99 GOTY or Serious Sam:TFE), my router evidently loses its IP address. Then no computer or tablet/phone is able to access the internet through wire or WiFi at all. I've played Shadow Warrior 2 for hours on end and this never happened, though. I've also completely uninstalled GOG Galaxy.

Another thing that happens with the games that shut down my router is when I run the shortcut or the exe, the game doesn't pop up. So I have to go to the task manager and shut downt the game's process. Then when I try to run the game again it runs normally.