Thats an obscure one
I seem to remember problems with their gear in the past though.....weren't they the ones who sold clones of the Psion 5 organiser? I had one and had problems with it
back to to the topic - I'd guess that a Windows update put in an older signed generic driver in place of the correct newer one
Check the Microsoft Update records - and be more selective over which of the "optional" ones you seelct
However I'll repeat - thats a guess