Try to restart you're computer, then look if there is an open program that mu guards detect it. Right click you're anti-virus & check the silent/gaming mode. There is suspicious program in you're desktop try to delete it that's why the m.u guard is appearing. Our m.u guard is high detection protected so no one will inject hack.
When you receive that problem,most likely your computer contains a program or a virus that is causing this,some of the programs are blocked from using and mu guard will detect them if you have them installed.Uninstall the program that is suspicious and your problem will be resolved.
If yourw using third party program hacjs or something better close it dude aha just joking scan youre computer dude maybe some viruses causing it give it a try..