It will open the System Protection box. Check the button beside Turn on system protection and change the slider to 100% beside Max Usage under the Disk Space Usage section. Click on Apply and OK ...
If this problem occurs due to a corrupt system file ... The most common reason why you can’t turn off or on Real-time protection on Windows 11 is because you already have a third-party antivirus ...
Then click Manage ransomware protection at the bottom of the screen. Next, turn on Controlled folder access. This setting ...