Just want to put up a couple of fixes for this for anyone who might be experiencing this problem, for a few weeks now when i boot up my PC in the morning i get a message saying i am running Steam in Compatibility mode which is not recommended and urges you to turn it off, not having a clue what this was or where i had to go to turn this off and not really seeing any difference in my Steam i just carried on playing, but over the last couple of weeks playing Insurgency and Attila Total War on the odd occasion my game crashed and on a few more occasions in the middle of a game it would just put me back on the Steam screen, game had not crashed i just had to click on the game icon and i was back playing but it is very annoying when you are in the middle of a Firefight in Insurgency when this happens, knowing that this is happening to a few of our Regular Insurgency breakfast club players too i decided to do a bit of research, this has never happened to me before but it seems to be a common problem, you, like me might have the "Compatibility" mode box ticked without even knowing it, anyway here are a couple of possible fixes for this problem, it's quite simple to do if you follow the instructions, hope this helps anyone who is experiencing this problem at the moment.
http://joshmccarty.com/2012/01/turn-off-compatibility-mode-for-steam/