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If the MpEngine folder is not present, right-click on the Windows Defender folder and select New -> Key to create it and assign the name to it locate the HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\MpEngine key.assigne the name PUAProtection to the newly created value and set it toġ (Enabled) to enable the PUA protection or to 2 (Audit Mode) to make PUAs being detected but not removed.right-click on the Windows Defender key and select New -> DWORD (32 bit) value.locate the HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender key.confirm the wish to open the registry editor against the (possible) security question posed by the Windows User Account Control.Regedit.exe and click the Registry Editor icon press Win + R, type regedit and hit ENTER to run the system registry editor alternatively, press Win + C, click Find, type.To activate the PUA protection feature in Windows Defender Any change executed on the operating system registry is the full user's responsibility. Microsoft cannot guarantee any solution to problems due to wrong use of the Windows registry editor. NOTE: It is strongly recommended to do a full backup copy of the system registry before editing.īe extremely careful and pay attention: any kind of Registry editing mistake can compromise the installed applications as well as Windows itself, thus making it necessary to reinstall application or the operating system.

Is not active by default and requires either a change in the Registry of the operating system, the activation of a policy using the Group Policy Editor or the execution of a PowerShell cmdlet to be available and active and increase the level of protection In addition to the base protection against viruses and malware in general, Windows Defender also incorporates a protection system by the equally widespread and annoying adware or other kinds of potentially unwanted applications (PUAs) however, this feature Windows Defender provides the system with a good standard protection in all the Windows versions it is natively available with.