Does your DVD show up in the Device Manager? If so, click on the DVD icon and your DVD Brand should be there, then right click on it and choose update driver.. If that does not work, choose Uninstall device, reboot your machine (leave the DVD plugged in) and Windows should hopefully detect it and install the proper drivers.
If your DVD does not show up in the Device Manager, try unplugging it and re-plug it in another USB port if you have another free one, if not, just re-plug it sometimes that is all that it takes.
If that still does not work, try rebooting anyway with your DVD plugged in and see if Windows picks it up.