Dishonored (Steam) problem

Hey all,
I'm running Windows 8 64-bit. It worked last night, but now I can't get it to launch. I keep getting this error:

Fatal Error!

Address = 0x1ca3920 (filename not found)
Address = 0x1ca3920 (filename not found)

Click to expand...

I've re-installed the game, it hasn't moved directories or anything. It was fine until I installed the DLC. The strange thing is, the numbers keep changing in the error, so I'm not sure whats going on.

I got that error too (exact same ones i think, or similar) when i was trying to play the pirated version awhile back. I pirate games to test-drive them to determine whether i'll buy. Have since purchased Dishonored on Steam and no issues. If your version is legit, tell Steam to check your Game Cache Files to see if any game files are missing. Right click on the game and select the Verify option (if you dont see it just dig around the right-click context/submenus for the game). If cracked, then I dont know what to tell you.