Try downloading the installer again, after launching it choose the Repair option. It will take you through Guardian setup again. Maybe that will stick.
thx for your info but didnt work aftyer about 15 or so minutes of dcs kept getting the reset guardian every 2 minute had to quit quite annoying wish could go back to the previous update seems that only happens when iam playing dcs since when on the home screen checking out the bear island etc have no issues might not haven watching for long enough to find out. Have to try again later for longer period to see if it related to dcs only