Gmod freeze at launch

When i launch Gmod, it freezes a sec after (shows the loading page). its not repsonding and i need to task manager end it. what can i do about it??? i feel bad for the money because i just bought it and its nor working…
I have a new gaming computer so its not a problem with hardware. i also bought CSS and Installed tf2 a week ago.

[editline]3rd July 2011[/editline]

Nevermind. i red the “READ HERE BEFORE POSTING” and found a solution.
Thanks.