When you plug in your phone, to be able to browse the folders on the computer you need to pull down the notification bar on the phone and mount the drives from the option there. Don't worry, I think a few of us made that mistake at first, just bare in mind it's not really failing of NPS
. Bare in mind for this to work without looking for drivers yourself, you'll need to turn debugging mode off, and tick mass storage only.
As for the unkown devices, you just need to point your computer to the PC Studio folder for the drivers.