Digital BW, The Print

I have recently up graded to IP v6 after using 5.6 without problems.
I can install IP OK and get the programme "Enabled"
When I turn my system on again after shutting down at night IP 
cannot fing the dongle.
The IP Support staff are being very helpful but so far the problem 
is not solved.  After un-installing the dongle MARKS files and 
reinstalling then re-inserting the Dongle the windows USP programme 
runs but fails to make the necessary connection(Error Message)  Then 
when I start IP the dongle number is OK and I can print.  After re-
boot same problem , no dongle connection.  Looking in Windows Device 
Manager there is an ! mark after installation against the USB v2 
line.  After the re-boot the exclamation mark changes to an red X 
over the USB symbol.  I did install Windows Service pack 2 when it 
came out some months ago.
Anyone had this problem or ideas on a solution ?
Chris