Diagnostic Service Host (WdiServiceHost) Defaults in Windows 7
The Diagnostic Service Host is used by the Diagnostic Policy Service to host diagnostics that need to run in a Local Service context. If this service is stopped, any diagnostics that depend on it will no longer function.
Default Settings
| Startup type: | Manual |
| Display name: | Diagnostic Service Host |
| Service name: | WdiServiceHost |
| Service type: | share |
| Error control: | normal |
| Object: | NT AUTHORITY\LocalService |
| Path: | %SystemRoot%\System32\svchost.exe -k LocalService |
| File: | %SystemRoot%\system32\wdi.dll |
| Registry key: | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WdiServiceHost |
| Privileges: |
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Default Behavior
Diagnostic Service Host is a Win32 service. In Windows 7 it won't be started if the user doesn't start it. When the Diagnostic Service Host is started, it is running as NT AUTHORITY\LocalService in a shared process of svchost.exe. Other system components, such as drivers and services, may run in the same process. If Diagnostic Service Host fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the WdiServiceHost service is not running because of the error.
Restore Default Startup Configuration of Diagnostic Service Host
1. Run the Command Prompt as an administrator.
2. Copy the command below, paste it into the command window and press ENTER:
sc config WdiServiceHost start= demand
3. Close the command window and restart the computer.
The WdiServiceHost service is using the wdi.dll file that is located in the C:\Windows\system32 directory. If the file is removed or corrupted, read this article to restore its original version from Windows 7 installation media.