Ahhh.. This is the joy of Windows update being checked whenever a "new" device is connected, even if the drivers are already installed. It can take a minute ot 2 to check Windows update before it decides that it has the latest software installed and use the already installed driver.
The best solution is to disable Windows update, but this will disable it for all hardware. This can be done by following this article:
http://www.displaylink.com/support/ticket.php?id=367
Wim