How to Repair Error Code DC040780 (Security Center Failed to Validate Caller) on Windows 10

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Windows is one of the most popular operating systems in the world. It is used by businesses in their offices and by home users. It is valued for its user-friendly interface, built-in problem-solving tools, and customization capabilities. However, it is a complex system that depends on thousands of processes to run smoothly. If one of these processes goes wrong, bugs, crashes, and errors can occur.

For some users, the error is displayed in the event viewer. It does not cause any particular symptoms, at least those that the user can perceive. The message users see is as follows:

Security Center was unable to confirm the identity of the caller with error DC040780.

What causes error code DC040780 ‘Security Center could not validate caller’?

• Conflict with third-party security software.
• Windows Defender rejects third-party security components.
• Corrupted system file.
• Outdated BIOS.
• Symantec Endpoint Protection failure.

How to fix error code DC040780 ‘Security Center could not verify caller’?

Uninstall third-party antivirus programs

1. Open the Run window by pressing Windows+R.
2. Type appwiz.CPL and press Enter.
3. In the Programs and Features window that opens, find your antivirus software.
4. Right-click on the software and select Uninstall.
5. Follow the instructions on the screen and complete the uninstall process.
6. Reboot your computer.

Reinstall Windows

1. Insert the DVD with Windows ready to run.
2. You will be asked if you want to continue booting from the CD or DVD. Press the Enter key.
3. Select the language settings and click Next.
4. In the bottom left corner of the window, click the Restore Computer button.
5. In the blue window that appears, click on Troubleshooting.
6. Then click on Advanced Settings.
7. Finally, select Auto Repair or Run Recovery.
8. Sit back and patiently wait for the automatic repair to complete.
9. Restart your system.

Turn off the Windows Defender firewall

1. Open the Run dialog box.
2. Type windows defender: and press Enter.
3. Select Virus and Threat Protection.
4. Scroll down to the bottom of the window that appears and find the “Virus and Threat Protection” setting.
5. Click Manage Settings.
6. In the window that appears, turn off real-time and cloud protection by toggling the appropriate buttons.
7. A UAC message will appear asking for permission; just click Yes.
8. Then click on Firewall and Network Protection in the sidebar.
9. Select active protection.
10. Scroll down to find Microsoft Defender Firewall.
11. Disable the Microsoft Defender firewall by clicking the Disable button.
12. If you see a UAC message, just click Yes.
13. Reboot your computer.

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