This happens due to modification and changes to the Group Policies or in Windows Registry. In this post; will show you that how you can solve the issue of “Windows defender turned off and is currently managed by your system administrator”. Follow the steps given below: Step 1 : Open Start, type: CMD Step 2 : Right click CMD Step 3 : Click Run as administrator Step 4 : Type in at the prompt then hit Enter REG DELETE "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender" /v DisableAntiSpyware Step 5 : Delete the registry value DisableAntiSpyware (Yes/No)? Y The operation completed successfully.