If you recently installed new antivirus software, such as Kaspersky or McAfee, it might interfere with the built-in antivirus. The Windows Defender summary notification is one of the easiest ways to tell that your PC is protectedĪnother common cause for Windows Defender not launching can be third-party antivirus. This happens because of Windows 10 updates or existing malware infections. For example, as with most other default apps on Windows 10, Defender may become corrupted over time. There are many possible causes for Windows Defender not launching.

Fixed! Windows Security Not Opening in Windows 11.

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.

Windows Defender won't turn on? This is a common problem.Īntivirus applications are essential to staying safe when browsing the internet.

Turn on windows defender antivirus