Garrys mod keeps crashing

Hi , i have some problems with my garrys mod . Every time i start the game and start playing . Everything goes wel until i spawn some npc’s or do some fighting with combine’s the game freezes and when i alt-tab out it says garry’s mod is nog working any more . Send email . dont send. can someone please help me

Geforce 9800 1024 mb
intel core quad 2.4 ghz
3 gb ram
Windows 7 - Ultimate Edition

have you tried removing some addons?

yea i removed alot but i still have some :S

everyone has a problem withit same here its latest update it destroyed somenthing