QoS Packet Scheduler - Windows Vista Service
QoS Packet Scheduler.
This service also exists in Windows 10, 11, 7, 8 and XP.
Startup Type
| Windows Vista edition | without SP | SP1 | SP2 |
|---|---|---|---|
| Starter | System | System | System |
| Home Basic | System | System | System |
| Home Premium | System | System | System |
| Business | System | System | System |
| Ultimate | System | System | System |
Default Properties
| Display name: | QoS Packet Scheduler |
| Service name: | PSched |
| Type: | kernel |
| Path: | %WinDir%\system32\DRIVERS\pacer.sys |
| Error control: | normal |
| Group: | NDIS |
Default Behavior
The QoS Packet Scheduler service is a kernel mode driver. If QoS Packet Scheduler fails to start, the error is recorded into the Event Log. Windows Vista startup proceeds, but a message box is displayed informing you that the PSched service has failed to start. At least one service depends on QoS Packet Scheduler. Therefore I do not recommend you to disable it.
Dependencies
If QoS Packet Scheduler is stopped, the Quality Windows Audio Video Experience fails to start and initialize.
Restore Default Startup Type of QoS Packet Scheduler
Automated Restore
1. Select your Windows Vista edition and Service Pack, and then click on the Download button below.
2. Save the RestoreQoSPacketSchedulerWindowsVista.bat file to any folder on your hard drive.
3. Right-click the downloaded batch file and select Run as administrator.
4. Restart the computer to save changes.
Note. Make sure that the pacer.sys file exists in the %WinDir%\system32\DRIVERS folder. If this file is missing you can try to restore it from your Windows Vista installation media.