Keyboard Class Driver (Kbdclass) Service Defaults in Windows XP

Keyboard Class Driver by Microsoft Corporation.

Default Settings

Startup type: System
Display name:Keyboard Class Driver
Service name:Kbdclass
Service type:kernel
Error control:normal
Group:Keyboard Class
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Kbdclass

Default Behavior

Keyboard Class Driver is a kernel device driver. In Windows XP it is starting right at Kernel initialization. If the Keyboard Class 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 Kbdclass service has failed to start.

Restore Default Startup Configuration of Keyboard Class Driver

1. Run the Command Prompt.

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

sc config Kbdclass start= system
sc start Kbdclass

3. Close the command window and restart the computer.

The Kbdclass service is using the kbdclass.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.