I'm still having this problem...

Whenever i start Garry’s Mod and go to singleplayer, it will load up to “Initializating resources” then give me a pop-up that says “hl2.exe has crashed searching for troubleshoot solutions” and such, same thing happens to multiplayer but it happens a lot quicker.

Post your specifications.

is it like this problem? http://forums.steampowered.com/forums/showthread.php?t=1869808