Hi,
Please try these steps:
1. Disconnect your device
2. Uninstall DisplayLink software from the Control Panel
3. Run the Cleaner tool from here:
http://www.displaylink.com/downloads/sla.php?fileid=121
4. Install 7.9 M0 from here:
http://www.displaylink.com/downloads/downloads.php
5. Reconnect your device
Thanks,
James