Gmod Crashes at loading screen

When i run Gmod and the guy pops up and then it stops there and the loading bar never comes up and the mouse pointer is spinning.

and it never starts

Please Help!

Inter Core 2 quad cpu q6600 2.40 ghz
Ram 3 gb
32 bits windows 7
ATI HD RADEON 5750 HIS

How about you post your specs?