Weird garrysmod crash...

Ever since i got my new computer there has been repeating crashes randomly. Screen freezes and if there was a sound that recently played, it loops forever, And i need to restart gmod again!

Specs:

Asus P6T SE [Motherboard]
Asus EAH5850 1GB [GPU] (Every map at 120+fps, probably not GPU problem)
Intel core i7 2.8GHz [You’re not dumb…]
4GB Corsair RAM 1333MHz [2x2GB]
Water coolant
500GB Seagate Barracuda [Harddrive]
Windows 7 Proffesional 64-Bit Edition