This policy setting allows you to specify the search server that Windows uses to find updates for device drivers. If you enable this policy setting, you can select whether Windows searches Windows Update (WU), searches a Managed Server, or a combination of both. Note: that if both are specified, then Windows will first search the Managed Server, such as a Windows Server Update Services (WSUS) server. Only if no update is found will Windows then also search Windows Update. If you disable or do not configure this policy setting, members of the Administrators group can determine the server used in the search for device drivers. Countermeasure: Enable this policy setting and select "Search Managed Server. Potential Impact: If you enable this policy setting, you can select whether Windows searches Windows Update (WU), searches a Managed Server, or a combination of both. Note: that if both are specified, then Windows will first search the Managed Server, such as a Windows Server Update Services (WSUS) server. Only if no update is found will Windows then also search Windows Update. If you disable or do not configure this policy setting, members of the Administrators group can determine the server used in the search for device drivers."

[search windows update/search managed server/search managed server, then wu]

(1) GPO: Computer Configuration\Administrative Templates\System\Device Installation\Specify the search server for device driver updates (2) REG: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DriverSearching!DriverServerSelection