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Summary

You may encounter Windows Defender error 577 when running Windows Defender. What may cause this Windows Defender error and how to solve it? This post shows you the answer. Besides Windows Defender, you can also use MiniTool Software to keep PC safe.

What Causes Windows Defender Error 577?

You may encounter the error “Windows could not start Windows Defender Network Inspection Service service on Local Computer” with error code 577 when running Windows Defender.

What may cause the Windows Defender error 577?

Most of the time, the Windows Defender error 577 occurs on a computer that has the third-party antivirus software. It can also be caused by the corrupted registry key belonging to Windows Defender. Or the Windows Defender may be blocked by the group policy.

However, in the following section, we will show you how to solve the Windows Defender error 577 Windows 10. If you have the same problem, try these solutions.

How to Fix Windows Defender Error 577?

This part will list several ways to solve the error 577 Windows Defender Windows 10

Solution 1. Uninstall the Third-Party Antivirus Software

As we have mentioned in the above section, the Windows Defender error 577 will be caused by the third-party antivirus software.

So if you have installed one, try uninstalling it firstly.

Step 1: Type Control Panel in the search box of Windows 10 and choose the best-matched one to enter its main interface.

Step 2: The choose Uninstall a Program under Programs to continue.

Step 3: Select the third-party antivirus software and right-click it, and then choose Uninstall to continue.

When you have successfully uninstalled the third-party antivirus software, run Windows Update again to check whether the issue Windows 10 Defender error 577 is solved.

5 Ways to Uninstall Programs Not Listed in Control Panel

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Solution 2. Change Registry

The second solution to solve Windows Defender error 577 is to change the Registry. Hence, to edit the registry, follow the following steps.

Step 1: Press Windows key and R key together to launch Run dialog, then type regedit in the box and click OK to continue.

Step 2: In the Registry Editor window, navigate to the specific folder according to the following path:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender

navigate to the specific folder

Step 3: Then select the Disable AntiSpyware from the right panel and right-click it, then change its value data to 1.

Note: If you can’t find Disable AntiSpyware key in the first location, try looking in HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender.

Step 4: Then double-click on Disable AntiVirus key and change its value data to 1.

After that, reboot your computer to take effect and run Windows Defender again to check whether the Windows Defender error 577 Windows 10 is solved.

If this method doesn’t take effect, you can try the following solutions.

Solution 3. Restart Windows Defender Service

The third solution for Windows Defender error 577 Windows 10 is to try to restart Windows Defender service.

Now, try the following steps to continue.

Step 1: Press Windows key and R key together to open the Run dialog, then type the services.msc in the box and click OK to continue.

Step 2: In the pop-up window, scroll down to find Security Center service, right-click it to choose Restart to continue.

restart Security Center

After that, reboot your computer, run Windows Defender, and check whether the Windows Defender error 577 is solved.

Solution 4. Run System Restore

If you have created a system restore point before, you can perform system restore to solve the Windows 10 Defender error 577 in Windows 10. Thus, you just need to restore your computer to an earlier state.

Thus, juts read the post What Is System Restore Point and How to Create It? Solutions Are Here! to know more information about performing system restore.

As a matter of fact, besides Windows Defender error 577, you may come across other Windows Defender error, such as Windows Defender error code 0x800704ec. So, in order to provide better protection for your computer, it is strongly recommended to create a system image when the computer is in a normal state.

When your computer comes across some accidents or system crash, you can directly use this system image to restore your computer to the normal state.

How to Restore Computer to Earlier Date in Windows 10/8/7 (2 Ways)

Final Words

In conclusion, we have introduced 4 ways to fix the Windows Defender error 577. If you encounter the same Windows Defender error, you can try these solutions. In addition, try MiniTool software to provide further protection for your computer.

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