Recently my laptop was infected by some malware and I used various programs to remove the infections "Malwarebytes, Eset online scanner, Superantispyware and AdwCleaner" but now I can't turn back Windows Defender (I'm on Windows 10) and each time I try I get the message "This app is turned off by group policy". What should I do?
Thanks for your answer. Unfortunately I couldn't do that because the infection I had on my laptop was really severe and I had to do a system restore without removing my files. Now everything is working fine on my laptop. Thanks again.