Thanks for the information on USB flash drives.
I am not sure which motherboard I have but think it is AO4 - that's what it says on the label anyway. I followed your links Kimbo and am now wondering if I should get rid of XP and go back to 2000. What seems like such a simple job - plug in my new USB gadget - is now turning into a major project.
The joys of our lovely computers.
Thanks again folks.