
Reset Windows Defender Service to Default Settings
If Windows Defender isn't starting, showing errors, or acting strangely, the service settings may...

If Windows Defender isn't starting, showing errors, or acting strangely, the service settings may...

You see "Windows isn't activated" or "We can't activate Windows on this device" even though you h...

You’re trying to sign in to Windows and the “Windows Security” window appears, but it eventually ...

You open Windows Security, click on Virus & threat protection, and get a blank page or a 404 erro...

If the Windows Security app (Microsoft Defender) is missing, won’t open, or shows errors, reinsta...

You try to run Windows Update and get an error like 0x8024401c or a message that the update servi...