Extreme Nooby

I bought and installed Garry’s Mod today, and after installing it I then opened it, I saw the main screen (Gman holding a gravity gun or whatever they are called) and then just as I thought it was going to show me the options like Play, Create Server ETC. instead the entire game went black and it said hl2.exe is not responding and the only option I had was to close the program. Can anyone tell me what I have to do to fix this or what is causing this and how I can fix it? Please all help is wanted I don’t want to have spent that $10 for nothing.

~Thanks.

Well… your hl2 is crashing, what is your computer’s specs?

Do you know if you have all the current updates?