Thanks for posting! We’re sorry you’re experiencing this problem!
The Dell Vostro is a Pentium Dual Core system, shipped originally with Windows Vista. Some sub-models had Intel GMA 3100 graphics, others had nVidia GeForce 8300GS or 8600GT. Either way, this system should work without any particular problems.
First step, can you download and install the latest drivers, available here? http://displaylink.com/support/downlo… (version 5.5 dated Sept 29th).
Then please let us know if the install displays any particular error dialogs, or succeeds. If the install succeeds, try that adapter again.
Again, thank you and we’ll get this going!