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Type regedit and press Enter to open Registry Editor.

Simultaneously press the “ Win” + “ R” keys to load the Run dialog box.Ģ.

Enable Windows Defender (Security Essentials) from Registry.ġ. Also, if you have problems during uninstall process and to ensure that the security application is completely removed from your system, run the removal utility provided by antivirus manufacturer. Make sure that you have uninstalled any other security application from your computer. Step 2: Uninstall any other Security Application from your computer. So, before you continue to troubleshoot the issues descripted in this guide, use this Malware Scan and Removal Guide to check and remove viruses or/and malicious programs that may be running on your computer. Many viruses or malicious programs compromise your protection by disabling the security product on your system. Note:Make sure that you have logged on your computer with an Administrator account, before you continue to the steps below. How to fix: Cannot Enable Windows Defender on Windows 10 or Windows 8. Cannot Start the Windows Defender Service.ĥ. Windows Defender is turned off or not working. When you try to Turn ON the Windows Defender (or the Security Essentials) the system opens at 'system32' folder.Ĥ. Cannot Enable Windows Defender or Security Essentials.ģ. Windows Defender (or Security Essentials) is disabled and cannot turn on.Ģ. In this tutorial you can find detailed instructions to resolve the following issues with Windows Defender or Security Essentials on Windows 10, 8 & 8.1:ġ. In other cases, the above issue, can occur if a malicious program has disabled the Windows default protection, in order to compromise your system. At this case the (previously) installed security product has modified the Windows Registry, so the default Windows protection cannot be enabled. The above issue, commonly occurs if you have installed a different security product on your system, but you have decided to return back to the default Windows security protection ("Windows Defender" on Windows 10 & Windows 8 or "Security Essentials" on Windows 7). But some users reported that when they click the Antivirus Protection – Turn ON button in Action Center (in Windows 10: Control Panel > Security and Maintenance), Windows Defender will not start but instead the system opens at "C:\Windows\System32" folder. In a previous tutorial I had described the way to enable Windows Defender on your Windows 7, 8 or 10 based computer.