U might have already tryed this but I'll have 2 do a manual install!
meaning go to control panel/device manager/ do let windows do any install for ya... u point 2 the driver file, and u say wich driver needs updated. Even if it tells ya everything is alright!
I have described this loads of times in posts about probs with intalling soundcards and stuff!
PS - ALWAYS USE THE SAME USB PORT!
Z