Hey,
I get this error when trying to launch black ops 2 through the Steam application. (this is for the free multiplayer weeken) I've tried deleting "ClientRegestry.blob" that didn't work, re downloading black ops 2 and steam didn't work. it's getting frustrating as i've always wanted to play CoD on PC as i'm a huge fan of the franchise on Xbox. Any feedback will help.
Thanks
-Connor