Here is what I did, using ideas gleaned from the websites listed below... and copying some of their comments... Thanks guys...
--I wanted to create a service that would allow me to spawn a command prompt under the context of the local system
sc create syscommand binpath= "cmd /K start" type= own type= interact
--Then I started the service
sc start syscommand
--Voila, apart from a few minor errors, the command prompt popped up (sigh of relief)
--Run Net to map a drive for the system context, then every user account, including the Administrator, will have access to that shared drive
NET USE Z: \\MyLocalMachine\MyLocalShare
--removed the service account
sc delete syscommand
Ideas taken from:
http://wmug.co.uk/wmug/b/scambler/archive/2011/02/07/interactive-command-prompt-under-the-system-context-and-server-2008.aspx
and
http://www.sevenforums.com/network-sharing/34110-run-admin-network-drive.html