Win10 system Windows Defender can not start can not open how to do

Recently many friends use Win10 system is encountered such a problem: When using third-party security software and uninstall, after switching back to the system comes with Windows Defender, but found it Can't open it. After opening, the system will pop up an error prompt window, as shown in the figure below. The following system home tells you how to get the Win10 system Defender can not start? 1. According to the error message, the first thing we suspect is that the application corresponding to the Windows Defender service has been tampered with by a third-party security application. 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 Files\\Windows Defender\\MsMpEng.exe”, and the service cannot be started by clicking Start, or it can be displayed after clicking, but Still not working properly, the error remains. ▼ In the "Windows Defender Service" service computer, we use the “tasklist /svc” command at the command prompt to view the service and program corresponding items as follows. The service PID process number is 2664, which corresponds to the "MsMpEng.exe" file. 2. However, after finding the corresponding application, we found that it was not tampered with after passing the certificate with the normal “MsMpEng.exe” file. 3, 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” (without the quotation marks on both sides) Then, let's take a look at the Windows Defender that prompts the error, it can be opened normally. The Win10 preview release has only been released for more than a month, and it has only been updated since 9860. Therefore, we will inevitably encounter problems of one kind or another during the experience and use, and third-party applications will need time to be compatible and adapted. Maybe after the subsequent Win10 preview update, Microsoft will completely fix this problem.