Windows 10 Services

Windows Defender Antivirus Service - Windows 10 Service

Helps protect users from malware and other potentially unwanted software.

This service also exists in Windows 7, 8 and Vista.

Startup Type

Windows 10 version Home Pro Education Enterprise
1507 Automatic Automatic Automatic Automatic
1511 Automatic Automatic Automatic Automatic
1607 Automatic Automatic Automatic Automatic
1703 Automatic Automatic Automatic Automatic
1709 Automatic Automatic Automatic Automatic
1803 Automatic Automatic Automatic Automatic

Default Properties

Display name:Windows Defender Antivirus Service
Service name:WinDefend
Path:%ProgramFiles%\Windows Defender\MsMpEng.exe
Error control:normal
  • SeImpersonatePrivilege
  • SeBackupPrivilege
  • SeRestorePrivilege
  • SeDebugPrivilege
  • SeChangeNotifyPrivilege
  • SeLoadDriverPrivilege
  • SeSecurityPrivilege
  • SeShutdownPrivilege
  • SeIncreaseQuotaPrivilege
  • SeAssignPrimaryTokenPrivilege
  • SeTcbPrivilege
  • SeIncreaseBasePriorityPrivilege
  • SeSystemEnvironmentPrivilege
  • SeTakeOwnershipPrivilege

Default Behavior

The Windows Defender Antivirus Service is running as LocalSystem in its own process of MsMpEng.exe. It doesn't share its process with other services. If Windows Defender Antivirus Service fails to start, the error is logged. Windows 10 startup proceeds, but a message box is displayed informing you that the WinDefend service has failed to start.


Windows Defender Antivirus Service is unable to start, if the Remote Procedure Call (RPC) service is stopped or disabled.

Restore Default Startup Type for Windows Defender Antivirus Service

Automated Restore

1. Select your Windows 10 edition and release, and then click on the Download button below.

2. Save the RestoreWindowsDefenderAntivirusServiceWindows10.bat file to any folder on your hard drive.

3. Right-click the downloaded batch file and select Run as administrator.

4. Restart the computer to save changes.

Note. Make sure that the MsMpEng.exe file exists in the %ProgramFiles%\Windows Defender folder. If this file is missing you can try to restore it from your Windows 10 installation media.