Are you only using Overdrive on your Vox? Do you have another reading app installed such as Kobo, (this one should be there by default) Aldiko or Mantano? Overdrive is used for library books generally, the other apps are used for purchased/other books.
There are many ways to get your books:
1- dropbox: open an account on the web, install on your PC and install the app on your Kobo. Copy your books to Dropbox on the PC, let it sync with the Vox and then open the book folder in dropbox on the Vox to get your books into whichever reader app you use
2- install Calibre (free) on your PC, add your books to Calibre, connect your Vox to the PC and drag/drop your books to the Vox. Calibre has it's own section on Mobileread forums to help you. With Aldiko and Calibre you can also move your books from the PC to the Vox wirelessly. Several threads have the instructions.
3- import books using an sd card from your netbook into the Vox.
Someone else will surely chime in eventually and give you other alternatives but these are my suggestions. I don't believe you can go directly from ADE to the Vox. Aldiko (free) will allow you to enter your ADE username into it and let you read DRM'd books on the Vox (purchased or library).
You can get Aldiko on Google Play.
I don't use the Kobo app, so can't give you any pointers there...