Finally I got it working!
Just in case anyone have the same problem, this is what I did.
1. Start -> Devices and Printers.
2. While have my kobo plugin, I click "Add a device" on the top menu
3. Windows did manage to find the ereader and install driver.
4. Under the Devices and Printers screen, eReader appears under Devices now.
5. Open kobo desktop and there it is!
6. Open my ADE, there it is also! Drag and drop all my pdfs there works
C.