Turn On Windows Defender Using the Registry Editor Use the DISM Command To Repair System Images Temporarily Disable Your Third-Party Antivirus
How To Fix Windows Defender Won’t Open in Windows 10. If you can’t open Windows Defender, or Windows Defender won’t launch at all, this article will help you fix the problem. It’s included to protect you from cyber threats like malware, hackers, and more. Windows Defender comes pre-installed on all Windows 10 systems. It’s a huge red flag if Windows 10’s built-in antivirus isn’t opening or won’t turn on at all. Some malware can even spread offline, only relying on file sharing. 
Whether you’re connected to a public WiFi or your private network, you’re vulnerable to a variety of attacks.
Input exit in the Command Prompt to close the app.Windows Defender won't turn on? This is a common problem.Īntivirus applications are essential to staying safe when browsing the internet. Reg delete "HKLM\Software\Microsoft\Policies" /f Reg delete "HKCU\Software\Microsoft\WindowsSelfHost" /f Reg delete "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies" /f Reg delete "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender" /v DisableAntiSpyware Reg delete "HKLM\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Policies" /f Reg delete "HKLM\Software\WOW6432Node\Microsoft\Policies" /f Reg delete "HKLM\Software \Microsoft\WindowsSelfHost" /f Execute the following commands separately, pressing Enter after inputting each one: reg delete "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies" /f. Click the Command Prompt app with the mouse’s right button to select a Run as administrator context menu option. Find the Command Prompt by typing in a CMD search phrase. 
Open the utility for finding files and apps with the Windows logo + S key combination. Then try running the registry commands for erasing policies like this: As those are reg delete commands, we recommend you back up the registry before applying this potential fix. Users also confirm that running a series of Command Prompt commands that modify the registry can resolve the “Page not available” issue.
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