Driver Verifier Extension (VerifierExt) Service Defaults in Windows 10

Driver Verifier component to help find bugs in device drivers.

Default Settings

Startup type:Manual
Display name:Driver Verifier Extension
Service name:VerifierExt
Service type:kernel
Error control:normal
Group:WdfLoadGroup
Path:%SystemRoot%\System32\drivers\VerifierExt.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VerifierExt

Default Behavior

Driver Verifier Extension is a kernel device driver. In Windows 10 it is starting only if the user, an application or another service starts it. If Driver Verifier Extension fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the VerifierExt service has failed to start due to the error.

Restore Default Startup Configuration for Driver Verifier Extension

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config VerifierExt start= demand

3. Close the command window and restart the computer.

The VerifierExt service is using the VerifierExt.sys file that is located in the %WinDir%\System32\drivers folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.