I had to rebuild my Win 7 DAW which meant getting Nano Kontrol back up. Axel F saved my life the first time but I forgot how to redo this setup. I had to document this process myself and came up with the following if it might help someone.
http://forum.cockos.com/showthread.php?t=29054
https://stash.reaper.fm/v/7589/nanokontrol.zip
1. Install Korg Nano driver and Korg Kontrol Editor Software.
2. Open Reaper and go to Options/Preferences (Ctrl P).
3. In Preferences, go to Audio/MIDI devices.
4. Double-click Nano in MIDI inputs and check both ‘enable’ boxes, Hit OK.
5. Double-click Nano in MIDI outputs and check the ‘enable’ box, Hit OK.
6. Visit above URLs and download nanokontrol.zip file. Extract zip.
7. Two files are present: scene set (.nktrl_set) and key map (.reaperkeymap)
8. Load scene set file into Nano via Kontrol Editor
a. Open Kontrol Editor and select File/Open/nano_reaper.nktrl_set
b. Click Communications/Write Scene Set/OK
9. Open Reaper, go to Actions/Show Action List, click Import. Locate and import nano1.ReaperKeyMap
10. If necessary, close/open Reaper and repeat steps 4 and 5.