Dependency Failure Black Ops 2

What the heck is this? Now I can't open Black Ops 2 and the multiplayer is downloading a big file from steam. Why this is happening?

Upgrade your C:\ page file to 4000mb max and 200mb minimum

Google is your friend there

why i get this ,,, dependency failure 2 hours i can play but now cant. SP,MP zombie installed. idea?

edit: mw3 work online play