I actually defaulted back to the original NVidia drivers (no geforce experience). I did however clean install them after a clean wipe of my drive and factory restore of the PC. My anti-virus is just the Microsoft Security essentials. There was one update that patched through after selecting the "check for updates". I did make an exception and selected yes at the time. I normally have the overlay open, or rather, Steam pushes it open once the game launches, to have running in the background.