Microsoft ACPIEx Driver Service Defaults in Windows 10

ACPIEx Driver by Microsoft Corporation.

Default Settings

Startup type: Boot
Display name:Microsoft ACPIEx Driver
Service name:acpiex
Service type:kernel
Error control:critical
Group:Boot Bus Extender
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\acpiex

Default Behavior

Microsoft ACPIEx Driver is a kernel device driver. In Windows 10 it is starting by the operating system Boot Loader as a part of the driver stack for the boot volume. If Microsoft ACPIEx Driver fails to load or initialize, Windows 10 attempts to record the error details into Event Log and restart the PC, using the Last Known Good configuration. If the Last Known Good configuration cannot be applied or working improperly, Windows 10 startup process halts with a Stop error. If you disable or delete the acpiex service, Windows 10 won't start.


While Microsoft ACPIEx Driver is stopped, disabled or working incorrectly, the following services do not start:

Restore Default Startup Configuration of Microsoft ACPIEx Driver

1. Run the Command Prompt as an administrator.

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

sc config acpiex start= boot
sc start acpiex

3. Close the command window and restart the computer.

The acpiex service is using the acpiex.sys file that is located in the C:\Windows\System32\Drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 10 installation media.