Please help, hl2.exe has stopped working upon joining a server and motd popping up

I have just recently bought Gmod while it was on sale and when i started to play it, i went to online and joined a zombie survival game, and upon joining the game crashed witht he hl2.exe has stopped working error, i thought this was a one time thing so i just went and opened gmod again and joined a jailbreak server, little did i know it happend again, this really got me sad and angry since i just bought the game and i cant evan play online, ive been searching everywhere for a solution but it is all mostly outdated like the vgui_allowhtml 0 command line. please i want this fixed quick.

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