If there are any problems and the Windows update components fail to run properly, then it can also trigger this error.
Most of the time, the corrupted system files of the computer is the main reason behind this error. Then, the Defender becomes unable to launch properly and shows the error code 0x80070426. But sometimes, the Defender becomes unable to replace the Security Essentials.Īs a result, both the Windows Defender and Microsoft Security Essentials are installed on the system.
During the upgrading process of the Windows Operating System, Windows Defender takes over and replaces the Microsoft Security Essentials.
