Limiting access to only 1 program for another user

I use XP home with my own admin logon. I have another
user that I want to allow only the ability to run 1
program. I don't want that user to access the hard drive
(like clicking on My Computer or using Explorer). I would
like that person to only be able to start up a program
and print it's reports. The Guest account and a new
account with limited access are still too flimsy. Can
anyone provide a workaround? Thank you.

Doug