Hi,
Regarding the audio and ethernet drivers not being installed can you try these steps:
1. Right click on device in device manager
2. Select Driver
3. Select Update Driver
4. Select Browse my computer for driver software
5. Select Browse
6. Enter C:\Program Files\DisplayLink Core Software\
7. Check Include subfolders
8. Select Next
Repeat for both audio and ethernet.
Regarding the WiFi disconnecting, this may be related to this FAQ:
http://www.displaylink.com/support/ticket.php?id=340
Thanks,
James