I've only got gmod a while ago (like 2 weeks ago), and I have the most irritating glitch that causes crashes. Well this is what it is: whenever I kill an AI with an automatic weapon or a shotgun, garrys mod crashes. Killing them with crossbows, rocket launcher, pistol, etc have no problem. I have already installed the latest directx and have tried cleaning gmod. Nothing works.
(Which is odd since I can put like 150 thrusters on a train and run over 30 npcs and not lag one bit).

Here are my specs:

Model: HP pavillion dv6000
OS: Vista home premium 32 bit
Ram:2.4 GB
Processor: Intel core duo 2GHz

video and sound cards are standard (plus I dont know where to look on my computer to figure out what they are).

Help appreciated very much.

Honestly, my guess would be the video card. You may have gotten unlucky enough to come with an integrated card that can't do shit. Literally 0mb of VidRAM.

heres the problem bro, took a few hours to figure out
youre gaming on a laptop, stop it.

Quote from 2-D

heres the problem bro, took a few hours to figure out
youre gaming on a laptop, stop it.

NoooOOOOOoooooo I cant afford anything else and minorities took over all the jobs in my town.

I finally figured it out, Gmod always said (in the options) that that the directx hardware level was 8.1, but half life 2 says that its 9. so I went to launch options and set the directx level to 9.
gee thanks for the help.