To resolve the Windows Defender Antivirus Error 577 problem, carry out the troubleshooting steps mentioned below.
Try to download the PC Repair tool from the manufacturer website.
Install and launch the PC Repair tool on your computer.
Click the Start Scan button to start the scanning process.
Once the problem is detected, click the Repair All button.
This will resolve the Windows Defender Antivirus Error 577 problem. If the issue remains unresolved, follow the instructions given here.
You can switch to a third-party antivirus software instead of using the built-in antivirus program, i.e., Windows Defender on the Windows computer.
The Windows Defender antivirus program offers only basic protection and it lacks some advanced features to protect the computer.
Registry:
Hold the Win and R keys together on the computer’s keyboard.
The Run dialog box will appear on the screen.
Once you type ‘regedit’ in the Open field, select the OK option.
As soon as the Registry Editor window appears, go to the ‘HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender’ key on the left panel.
On the main panel, find the DisableAntiSpyware option and select it.
Change the value from o to 1 in the Value Data field and click the OK button.
Likewise, change the value for DisableAntivirus.
Exit the Registry Editor window and navigate to the C:\Program Files\Windows Defender location.
Run the MSASCui.exe file.
Removing the Third-party Antivirus Program
The built-in Windows Defender antivirus program will not work properly if you have installed any third-party antivirus on the Windows computer.
Because, the third-party antivirus will interfere with the Windows Defender program.
Try to remove or uninstall the installed third-party antivirus software from the Windows computer.
Notification Center:
Enable the Windows Defender antivirus from the notification center.
Navigate to the notification center at the lower-right corner of the screen.
If you see the alert message, click it. Now, the Windows Defender Antivirus Error 577 will be turned on.
Security Permissions:
Before you proceed with the following instructions, create a registry backup.
Launch the Registry Editor dialog window and search for the ‘HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender’ key on the right panel.
Right-click this key and select the Permissions option.
Click the Advanced button followed by the Add button.
After you click the Select a principal option, fill both the Object Name and Username fields and click the Check Names button.
Confirm that the entered username is correct, click the OK button.
Once you check the Full Control field, click OK -> Enable Inheritance -> Apply -> OK.
Restarting the Windows Defender Service:
Enter ‘services.msc’ in the Run dialog box.
Note: The Run dialog box can be launched by holding the Win and R keys at the same time.
Search for the Security Center service, right-click it, and select the Restart option.
Go to the Services window, find the Windows Defender service, and select the Start option.
Now, both the Security Center and Windows Defender service will start.
If the Windows Defender 577 problem persists, create a user account.
If required, contact our technical support members by clicking the Call button mentioned below to get remote assistance in resolving the Windows Defender Antivirus Error 577 problem.