Hi,
Assuming you have a yellow exclamation mark against the drivers in Device Manager please try these steps:
Right click on device in device manager
Select Driver
Select Update Driver
Select Browse my computer for driver software
Select Browse
Enter C:\Program Files\DisplayLink Core Software\
Check Include subfolders
Select Next
If that doesn't produce the required result please unplug your device from your computer, unplug and replug the power to the device and reconnect the device to your computer.
Still having issues after this? Please post the logs as described here:
http://www.displaylink.org/forum/showthread.php?t=896
Thanks,
James