Garrysmod crashing when I join a server!

I have been playing Garrysmod for 2 years now and this has never happend to me. I have 3gb ram, Nvidia Geforce 9600 graphics card, and I am running XP. It never happens when I play singleplayer, only in multiplayer. Also I’ve already reinstalled Garrysmod. Here is a picture of the error:

I would be grateful for any help! Thanks!

Happens to me sometimes, i believe that the error is pertaining to the amount of RAM available to use (correct me if im wrong.) Just try to restart Gmod and close out of some other programs.

Delete your cache folder

I have this solved if you look here:

http://www.facepunch.com/threads/822683-The-Help-and-Support-FAQ-(CHECK-HERE-BEFORE-POSTING-A-THREAD)