QoS Packet Scheduler (PSched) Service Defaults in Windows XP

QoS Packet Scheduler.

Default Settings

Startup type:Manual
Display name:QoS Packet Scheduler
Service name:PSched
Service type:kernel
Error control:normal
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PSched

Default Behavior

QoS Packet Scheduler is a kernel device driver. In Windows XP it won't start until the current user starts it. If the QoS Packet Scheduler 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 PSched service has failed to start.


QoS Packet Scheduler depends on the Generic Packet Classifier service.

Restore Default Startup Configuration for QoS Packet Scheduler

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

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

3. Run the saved file.

4. Restart the computer.

The PSched service is using the psched.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.