The warning is a standard message Symantec insert on all technotes that require the registry edited as part of a solution.
The registry key you mention is for the Placeholder Service which is on the file server where the EV FSA Agent has been insta...
The Registry Key should be HKEY_LOCAL_MACHINE\Software\KVS\Enterprise Vault\FSA\PlaceholderService
This is only for use on the file server where the Enterprise Vault FSA Agent has been installed, the Enterprise Vault FSA Agent is not installed on a ...