Cannot Start Gmod

Everytime I try to start Gmod, it starts the game, and the blue bar begins to load, but about 90% completion, the game exists out and says there is an error with the hl2.exe.

So far i’ve tried to reinstall Gmod, but that didn’t seem to do the trick.

Any ideas?

Anyone…?

Er…it might have to do with some pipeline x86 thing…