Solve the Win10 preview version of Windows Defender can not start the way

Recently, many friends have encountered a very troublesome problem in the process of using the Win10 preview version, the problem is specifically: when using other third-party security software After uninstalling, I wanted to change back to the Windows Defender that came with the system, but I was surprised to find that it could not be opened. After opening, the system will pop up an error prompt window, as shown in the figure below. Bent brought you the specific solution process and solution for this problem, for the reference of friends who encountered this problem.

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 it is not possible to start the service by clicking Start, or Click to display the run, but still can not be used normally, the error remains.

▼In the "Windows Defender Service" service, we use the “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.

2 However, 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.

3, Windows Defender original file is no problem, but given such an error message, 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 prompted the error before 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. Readers who have problems with using and experiencing Win10 are welcome to share your questions in the comments section below or in the IT Home Forum.

According to this report, the new version of Win10 preview version with version number 9879 has been exposed, bringing IE11 feedback mechanism, new resource manager layout, allowing to remove search and task preview buttons, and locking screen to increase power. Notice and many other new features, please refer to "Win10 Preview 9879 New Change One: IE11 Toolbar Sudden Smiley Icon".