L4D infected models crashing?

I don’t know if this is warez if it is I am sorry don’t ban me.

But I downloaded the Left 4 dead infected models here http://www.garrysmod.org/downloads/?a=view&id=56957 and it seems that now whenever I start a singleplayer game gmod freezes and crashes my computer.
I can’t alt-tabout, I can’t turn off the pc with the switch on the tower, my pc goes unresponsive and I have to turn it off at the plug socket. And that is bad for my pc. I want to know if this is the cause.
If this is warez I am sorry, I don’t mean to so don’t ban me.

Remove the infecteds models, use this. http://www.garrysmod.org/downloads/?a=view&id=57590
Also, its not warez because they are from the demo.

Thank you