Hello!

Yesterday I was playing (or trying to) HL2. Then, a little message appeared:
"AI disabled" and something about "node graph".

I can't play the game, the AI is completely stopped.

Any advice?
Thanks!

Is this a retail version or is this a pirated/cracked release? If it's the latter, buy the game.

Nope, it's the retail version
I really like Half-Life, that's why I bought it.

That error was produced by me . I've been messing a lot with cfg files, and I think I screwed up something

I finally found the solution to it. I had to edit the autoexec.cfg file, somehow it was "damaged". That's why it didn't work. I followed a guide to create a new one, and everything works fine now. Pheewww!!

Thanks a lot anyway!

Usualy an error affecting ai like this is telling you something is wrong with the map as far as ai objectives/movement goes.

Yeah, I moved a lot the cfg files I think I screwed up something