Win10 Defender can not start the response measures

Workaround:
1, according to the error message, we first suspect that the application corresponding to the Windows Defender service has been tampered with by third-party security applications. You can query the application corresponding to the Windows Defender service by using the “Windows logo key+R” to open the Run window and entering “services.msc”; or by using the “tasklist /svc” command in the Command Prompt window. program.
After querying, we can see that the application path corresponding to the service is "C:Program FilesWindows DefenderMsMpEng.exe", and it is not possible to start the service by clicking Start, or to display the operation after clicking, but still can't Normal use, the error remains.

2. In the "Windows Defender Service" service, we use the <quo;tasklist /svc” command at the command prompt to view the service and program dependencies as follows. The service PID process number is 2664, which corresponds to the "MsMpEng.exe" file.

3. After finding the corresponding application, we found that it has not been tampered with by comparing it with the certificate of the normal “MsMpEng.exe” file.

4, Windows Defender original file is no problem, but given such an error, and can not open the service through the normal service management page. This problem is probably a bug in the current Windows 10 operating system. To solve this problem, right click on the “Start button” and select “Command Prompt (Administrator)”, enter the following command, and then press “Enter].
“sc start WinDefend Enable” (Does not contain quotes on both sides)

5, then, look at the Windows Defender that prompts the error, it can be opened normally.

Windows Defender is a security protection software built into Microsoft Windows. This software is also built into Win10. Sometimes it will conflict with other third-party software, so users use third-party security software. Be careful.