problem with loading gmod

Hi, I’ve got a prob when loading gmod. I can get in the main menu and join a multiplayer game but when gmod gets to the point in loading that it’s initialising recources it hangs(I’ve let it run loading half an hour)

don’t say I have to run steam as an admin because I did.

I u think I’ve pirated gmod check the steam ID bootv2

My system specs are: CPU: intel i5 750
2GB ddr3 1300
ati hd5770 1GB ddr5
1000GB HD
Windows 7 ultimate x64

edit: avast was somehow blocking the code gmod is using while loading.