Hi Windeath
Thanks for your offer of help. I ended up spending the afternoon fiddling and found a Logitetech Forum which gave me a few clues like "remove the dongle - reboot -reinsert the dongle into the stand holding down the 'connect' button" and "remove the batteries from the keyboard, leave it switched on - then spend 40 seconds typing - reinsert the batteries and try to connect."
And to think I thought Mr Gates was funny telling you to hit the start button to turn off the computer!!
Finally - in desperation I used control panel and removed anything that had Logitech on it and anything Widcomm and re-installed from scratch. I finally have it working.
I'll pack it all in cotton wool overnight and hope it works in the morning!
I seem to have never ending problems installing Logitech products!
Thanks again
Ccorpcc