how do I reinstall windows defender for windows 10

Hi LucyBake you cannot unistall Defender Programe coz this is the Windows built-in programme i think you have disabled it. To enable go to run (Win + R) and type (msconfig) then click OK select the services tab scroll down and find Windows defender in the list.

Is there a check in box? If no, select it click on OK close out and restart the computer. If yes, it is OK, go to Run and type  (SERVICES.MSC) click OK and locate for Windows Defender Service right click on it select properties select automatically under startup type then click OK, then restart your PC.

Please perform all steps with adminisrator login. and please let me know the result.

Thanks

hi

its been 2 month no solution

Windows Defender for Windows 10

I am getting error  0x80070422

never installed any antivirus

Windows Defender Service WinDefend is grayed cannot change or start

Windows Defender Advanced Threat Protection Service is grayed cannot change or start (err 13: the data is invalid)

I scan with latest mrt my system is clean  sure no virus

genuine windows 10 dell precision 5510 

Tried both methods did not work

second method received an error code # 577

this is the same method described by various people that doesn't work

I came upon a suggestion by somebody that if you installed another virus protection

the windows defender switches off

now what I like to know does Microsoft say that if you have windows defender

you don't need any other virus or malware protection?