Windows Defender error 577 may occur when you run Windows Defender. Windows Defender error 577 may occur when you run Windows Defender. How can it be fixed? This article will provide the solution. You can use security software to protect your computer, in addition to Windows Defender.

While there are many alternatives to the Microsoft-built antivirus, Windows Defender is still a favorite among many users. It comes with Windows installation and does not require any fees to get protection. However, Windows Defender has stopped implementing any protection and started warning users. Some users tried to launch Windows Defender Antivirus Service and Network Inspection Service by going into Services. Users receive error 577 when trying to launch Windows Defender Antivirus Service or Network Inspection Service. This is because Windows cannot verify the digital signature of the file. We will discuss other solutions below if this is your situation.

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What could be causing the Windows Defender error 577

The Windows Defender error 577 most often occurs when a third-party antivirus program is installed on the computer. The corrupted registry key of Windows Defender can also cause this error. The group policy may also block Windows Defender.

We will however show you how to fix Windows Defender Error 577 on Windows 10 in the next section. These solutions may help you if you are experiencing the same problem.

How do I fix Windows Defender error 577?

This section will provide several solutions to the error 577 Windows Defender Windows 10

Solution 1. Uninstall the Third-Party Antivirus Software

The third-party antivirus software will cause the Windows Defender error 577, as we mentioned above.

If you have already installed one, uninstall it first.

Step 1: Type Control panel in the search box for Windows 10 and select the most compatible one to enter the main interface.

Step 2: Next, choose Uninstall a program under Programs to continue.

Step 3: Select third-party antivirus software, right-click on it, then select Uninstall to continue.

After you have uninstalled third-party antivirus software successfully, restart Windows Update to verify that the Windows 10 Defender error 577 has been resolved.

Solution 2. Change Registry

To fix Windows Defender error 577, you can also change the Registry. These are the steps to modify the registry.

Step 1: Press Windows Key and R together to launch Run dialog. Type Regedit into the box and then click OK to continue.

Step 2: Navigate to the folder you want to modify in the Registry Editor window.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender

Step 3: Next, select Disable AntiSpyware in the right panel. Then right-click on it and change its value to 1.

Step 4: Double-click on the Disable AntiVirus key to change its value to 1.

Reboot your computer after that. Run Windows Defender again to verify that the Windows Defender error 577 Windows 10 has been fixed.

Solution 3. Restart Windows Defender Service

Windows Defender error 577 Windows 10 can be fixed by restarting Windows Defender service.

To continue, follow these steps.

Step 1: Press Windows Key and R together to open the Run dialog. Type the services.msc into the box, and then click OK to continue.

Step 2: Scroll down in the pop-up window to locate Security Center service. Right-click it and choose Restart to continue.

Solution 4. Run System Restore

To fix the Windows 10 Defender error 577, you can use system restore if you have previously created a system backup point. You can simply restore your computer to an earlier time.

Last Words

We have provided 4 solutions to solve Windows Defender Error 577. These solutions can be used if you experience the same Windows Defender error. You can contact windows defender customer support team to get instant help.

Source: Fix Windows Defender Error 577