Update Problem, can't start GMod. HELP!

Alright, since the update about 5 updates ago, every time I start GMod, it just takes a very long pause, then it says something like “Hl2.exe has stopped responding. We are sorry for the inconvenience.”
I couldn’t fix it so I just took my old GMod 57 GCF (Which I saved.) and downgraded it. I cannot use Wiremod like this or go online so I come here for help! How do I fix this?!

YES I PURCHASED GMOD. -.-"

Happening to me and a friend, he kept trying and it started working.

Garry will roll back the patch soon or release a fix, don’t worry.