Microsoft ACPI Driver Service Defaults in Windows XP

ACPI Driver for NT by Microsoft Corporation.

Default Settings

Startup type:Boot
Display name:Microsoft ACPI Driver
Service name:ACPI
Service type:kernel
Error control:normal
Group:Boot Bus Extender
Path:%SystemRoot%\system32\DRIVERS\ACPI.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ACPI

Default Behavior

Microsoft ACPI Driver is a kernel device driver. In Windows XP it is starting before Kernel initialization. If the Microsoft ACPI Driver fails to start, the technical information about the error is added to the Event Log. Windows XP startup should proceed, but a message box should be displayed informing the user that the ACPI service has failed to start.

Restore Default Startup Configuration for Microsoft ACPI Driver

1. Select your Windows XP edition and service pack, and then click Download.

2. Save the WinXP_ACPI_Service_Startup.cmd file to a local storage device.

3. Run the saved file.

4. Restart the computer.

The ACPI service is using the ACPI.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 XP installation media.