The Diagnostic Service 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. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\System Services!Diagnostic Service Host (2) REG: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\WdiServiceHost!Start