batcmd.com Windows Vista Services

Diagnostic System Host - Windows Vista Service

The Diagnostic System Host service enables problem detection, troubleshooting and resolution for Windows components. If this service is stopped, some diagnostics will no longer function. If this service is disabled, any services that explicitly depend on it will fail to start.

This service also exists in Windows 10, 7 and 8.

Startup Type

Windows Vista edition without SP SP1 SP2
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Default Properties

Display name:Diagnostic System Host
Service name:WdiSystemHost
Type:share
Path:%WinDir%\System32\svchost.exe -k LocalSystemNetworkRestricted
File:%WinDir%\system32\wdi.dll
Error control:normal
Object:LocalSystem
Privileges:
  • SeChangeNotifyPrivilege
  • SeImpersonatePrivilege
  • SeTcbPrivilege
  • SeDebugPrivilege
  • SeAssignPrimaryTokenPrivilege
  • SeIncreaseQuotaPrivilege
  • SeProfileSingleProcessPrivilege

Default Behavior

Diagnostic System Host logs on as LocalSystem and runs in a shared process of svchost.exe. If Diagnostic System Host 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 WdiSystemHost service has failed to start.

Restore Default Startup Type for Diagnostic System Host

Automated Restore

1. Select your Windows Vista edition and Service Pack, and then click on the Download button below.

2. Save the RestoreDiagnosticSystemHostWindowsVista.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 wdi.dll file exists in the %WinDir%\system32 folder. If this file is missing you can try to restore it from your Windows Vista installation media.