PCI Bus Driver Service Defaults in Windows XP

NT Plug and Play PCI Enumerator by Microsoft Corporation.

Default Settings

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

Default Behavior

PCI Bus Driver is a kernel device driver. In Windows XP it is starting before Kernel initialization. If the PCI Bus Driver fails to load or initialize, the error is logged and the computer attempts to restart with the LastKnownGood configuration. If the LastKnownGood configuration fails, Windows XP startup also fails, and the boot process halts with a Stop error. If you disable this service, Windows XP will fail to start. Do NOT change this service startup configuration if your computer is working.

Restore Default Startup Configuration of PCI Bus Driver

1. Run the Command Prompt.

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

sc config PCI start= boot
sc start PCI

3. Close the command window and restart the computer.

The PCI service is using the pci.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 XP installation media.