Hey i wanted to play co-op with one of my friends recently and the game starts fine, can access anything normally apart from the campaign. been playing loads of last stand and it works totally fine. but the the whole game crashes instantly (or within 1 sec anyway) of pressing the Campaign button in the main menu. it also bugs out when my friend invites me to a coop campaign, first it does an eternal load and then stops in an error message or game crash every time.
Is there a way to fix this? have been looking around for solutions for a while now. have verified cache, un/reinstalled several times including the earlier titles (can play the older campaigns fine just not retribution), been playing around with the nvidia control panel power settings, running in administrator mode and compatibility mode. the button in the top right is green and shows the steam logo fine. debugged my whole computer and defragged it.
im running windows 7, just like i did last i played the campaign, but that was back with the windows live stuff. multiplayer and last stands works perfectly. What can i do??