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 of QoS Packet Scheduler

Before you begin doing this, make sure that all the services on which QoS Packet Scheduler depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt.

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

sc config PSched start= demand

3. Close the command window and restart the computer.

The PSched service is using the psched.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.