If you searched in the forum using the "Executable integrity compromised", you would have found several discussions about this, it's a problem caused by another product (probably non-flight sim related) that is using very dangerous methods to attach to all your running programs.
One of the most common causes, is the "ATI Tray Tool" utility, with the "automatic overlock" feature turned on. But if you don't have that one, there might be similar products, one user had it with a power management utility.