How do I fix a corrupted Windows Defender?

How do I reset Windows Defender?

Open the classic Control Panel (not Settings). Click on Windows Defender Firewall. Click on Restore defaults. Click on Restore defaults a second time.

Can I uninstall and reinstall Windows Defender?

To resolve this issue, you may need to uninstall and reinstall the Windows Defender.


  • Click Start, Control Panel.
  • Click Add or Remove Programs.
  • Click Windows Defender, and click Remove.

How do I fix Windows Defender in Windows 10?

Replies (64) 

  1. Press Windows + X, Click on control panel.
  2. On right top corner click on View and then choose large items.
  3. Now from the list click on Windows Defender and try to enable it.
  4. Press Windows + R, to open run prompt.
  5. Type services. …
  6. Under services look from Windows defender service and start the service.

Can we reinstall Windows Defender Windows 10?

Defender cannot be reinstalled separately as it is part of the OS.

Why Windows Defender not working?

If Windows Defender is not working, that’s usually caused by the fact that it detects another antimalware software. Make sure you uninstall the third-party security solution completely, with a dedicated program. Try checking the system file by using some built-in, command-line tools from your OS.

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How do I fix Windows Defender not opening?

Problems starting Windows Defender in Windows 8/8.1/10

  • Restart your PC. …
  • Remove existing antivirus and antispyware software. …
  • Scan your PC for malwares. …
  • SFC scan. …
  • Clean Boot. …
  • Restart Security Center Service. …
  • Delete conflicting Registry Entry. …
  • Enabling Windows Defender from Group Policy.

How do I reinstall Windows firewall?

e) Press Windows key + X and select “Command prompt (Admin). g) Press Windows key + X and click Run, type firewall. cpl, and then press ENTER. In the Windows Firewall dialog box, click “On” (recommended), and then click OK.

How do I reinstall Windows Antivirus?

1 Answer

  1. Select Start > Settings > Update & Security > Windows Security and then Virus and Threat Protection > Manage Settings. (In earlier versions of Windows 10, select Virus and Threat Protection > Virus and Threat Protection Settings.) …
  2. Change the realtime protection setting to On / Off and choose Yes to verify.

Why is my Windows Defender antivirus turned off?

If Windows Defender is turned off, this may be because you have another antivirus app installed on your machine (check Control Panel, System and Security, Security and Maintenance to make sure). You should turn off and uninstall this app before running Windows Defender to avoid any software clashes.