Can't launch gmod multiplayer or srcds multiplayer !

Hi !!
I can’t launch a server from my computer.
I have tryed to reinstall steam, I have tryed to format my computer but it’s the same.
There’s one month ago it was work.
I’m running windows 7, nothing added on gmod, Intel Core i3-2100 CPU @ 3.10 GHz
4.00 GO RAM
64 bits.
I oppened 27015 tcp/udp and all other ports wrote on STEAM wiki.
Thanks for any help !

Here’s a dump : http://dumps.garrysmod.com/?view=1810053743

Up :’(