Yahoooo!, YeeeeHaaaa!, By George I think I've cracked it!!
Took off kerio personal firewall, after some considerable difficulty, and installed zone alarm free.
Ran the setup wireless network wizard for home and small office on each computer.
Took note of each computer's IP address and entered it into zone alarms trusted zone, clicked apply and, then clicked view computers on network (or something similar) and there both were, on both computers.
Short delay while I set up my printer from the remote laptop and printed a document from my laptop downstairs on my printer upstairs.
I know that it means I have to have both computers on as well as the printer but, I am a happy bunny.
All files shared between both desktop and laptop, so I now have a fully functional home (wireless) network.
Thanks to all who helped, especially Sandra who not only knows her stuff but looks good too! :wink: