Gmod crashes!

Hey guys!
I would be happy, if you could help me solve this problem.
See the recent month i has experianced that my Gmod keeps disconnecting, from
the servers i join.

It leaves this message in console.

Disconnect: Client timed out.
Disconnect: Client timed out.

I have tried.
Re-installing Gmod.
Defragmenting Gmod.
Used the tools in properties under Steam.

So this is last resort, except reestablishing factory settings.

Well this is a new oneā€¦

Have you checked to see if you can connect to server in other source games?

No i have not, should i check that?

[editline]20th October 2010[/editline]

Well my Tf2 works.

I guess no one has the awnser to my post.