I always use Safely Remove, as I have seen what can happen if I don't :)
When I run the driver installer that comes from DELL's site then I get this:
The thing is, when I look at the .inf file for the monitor drivers, then there is nothing for the USB device.
DELL actually claims they are included in Windows itself, and I DID have it running until I removed the device.
An interesting thing is, I chose to try and do a manual installation.
At first I tried "Search automatically for updated driver software".
It failed, saying that Windows couldn't find any drivers.
I then used "Browse my computer for driver software"
At first I tried pointing to the "Dell u2711\WinVista7" folder.
It failed, saying that Windows couldn't find any drivers.
I tried "Browse my computer for driver software" again,
this time selecting to use "C:\Windows\System32\DriverStore\FileRepository".
VIOLA!!! Driver was found and installed correctly.
It's as if Windows are looking in the wrong places for drivers?!?!