gmod crashes often

Ok im in a multiplayer game some of the other people have weapons. I don’t know if its the sounds of the weapons or what but every time a shotgun, rocket, or anything explosive goes off i immediately crash. The only thing in my launch options is -console and these are my comps specs.

Manufacturer: Hewlett-Packard
Processor: Genuine Intel® CPU T2400 @ 1.83GHz (2 CPUs), ~1.8GHz
Memory: 1526MB RAM
Hard Drive: 110 GB
Video Card: Mobile Intel® 945 Express Chipset Family
Monitor: Generic PnP Monitor
Sound Card: Speakers (Conexant High Definition SmartAudio HD2)
Speakers/Headphones: Philips Surround sound headset
Keyboard: USB Root Hub
Mouse: USB Root Hub
Operating System: Windows Vista™ Business (6.0, Build 6000) (6000.vista_gdr.080917-1612)

It is a laptop but it has never had any problems playing higher rate games. Pretty sure if it can support halo 2 for vista it shouldnt have any problems with gmod.

Thanks in advance.