I keep getting a window popping up on my Vista laptop telling me that "One
of the USB devices attached to this computer has malfunctioned and Windows
does not recognise it."

If I click on the window for more information I get another window stating
that "The location of the device is shown in bold type".

There is then a tree headed 'USB Root Hub (6 ports) and the 'problem' port
is number four - which puzzles me because my laptop only has two USB ports.

Only one of my two USB ports is in use - with a Logitech 'nano' wireless
mouse receiver. The mouse is working perfectly.

Any suggestions?

--
Kev