If you didn’t turn off Microsoft Defender since the last time you restarted your computer, Microsoft Defender is most likely disabled because you installed a different antivirus program. You’ll need to remove the antivirus program to re-enable Windows Defender.
You may have to expand the Windows Security window by clicking the square in the top-right corner of the window before proceeding.
If you know the antivirus program’s name, skip this step.
If you know the antivirus program’s name, skip this step.
If you didn’t intentionally install an antivirus program, you’ll probably find the program you need to uninstall near the top of the list of programs if your Windows Defender only recently turned off.
If Microsoft Defender doesn’t turn back on after your computer finishes restarting, you can try turning it on manually.
If Microsoft Defender doesn’t turn back on after your computer finishes restarting, you can try turning it on manually.
If Microsoft Defender doesn’t turn back on after your computer finishes restarting, you can try turning it on manually.
If Microsoft Defender doesn’t turn back on after your computer finishes restarting, you can try turning it on manually.
