"Hl2.exe has stopped working" Getting this error every 10 minutes.

So I’m getting the “Hl2.exe has stopped working” every 10 minutes.

My System Specs:

I’m pretty sure that my system can handle Garry’s Mod, I’ve defragged the game and verified the game cache, I don’t think theres a lot more I can do. I have even turned down my graphics on Gmod but that still didn’t help. Any ideas?