Texture error/crash cant find help with it

ok so this error happens sometimes not really rare for me and not ocassionaly, what does happen ocassionally is my gmod randomly closing straight to the desktop while playing… that gets annoying so id like help with that also

anyway back to the error

while im playing on a server my pc freezes including gmod, the avast logo still spins though, ctrl alt del will not come up, then all of a sudden the game comes back on and instantly looks similar to this
(the textures vary for each crash thingy i get but text comes in blocks all the time this happens)

the only way i can resolve this is restarting gmod and starting back up, it effects the text on the main menu also

http://img11.imageshack.us/img11/3068/gmodtextureerror.png

on ctrl alt del my page file is at 2.5gb when this happens and gmod runs at 900,000k virtual memory and memory

if that has anything to do with it…

anyone know 0_o?

Shit like this happens when you have an overheating card

check yer temps and post your PC specs

sorry for getting back late longears34, anyway currently with speedfan my idle temps are

GPU 47C
SYSTEM 37C
CPU 45C
AUX 44C
CORE 39C

my specs are

http://img127.imageshack.us/img127/79/systemspecsfacepunch.png