I had originally used Windows 7 64bit I think home edition, I recently upgraded to ultimate 64bit. I reinstalled reason, etc.. I plugged in my nano thinking it would just work by default after windows installed its drivers, and nothing, I downloaded the drivers from korg, and nothing, its in my device manager, it all appears right. But when I open up reason5, I dont see anything under the midi in/out.

I uninstalled korg drivers, tried a older version and nothing.

I know it works cause it was working before, my axiom 49 works perfectly without having to install any drivers. This is really frustrating. After I installed the editor, I can get a midi out port that shows nano kontrol 1- or something. At one point I got it to recognize something, as I was trying to assign controls in reason, and only one fader would work, and it worked under a 'breath' command. So .. idk. I've read other people having success not using the korg drivers and just plugging it in and letting windows download whatever it downloads and ppl say it works, windows does this, tells me its installing Korg NanoKontrol drivers, etc.. restart, nothing works.
*EDIT* Ok so I found the solution to get this working in Reason4 I havent tried it in anything else but I can only assume this should work for other things. Go to start, search 'midi' click CONFIGURE KORG-USB MIDI DRIVER, look under advanced you'll see a tab that says MIDI-IN and a drop down menu with the following options; 64bit, 32bit, BOTH! Mine was set to 64bit, changed that to BOTH. BAM! IT WORKS ALL CONTROLS !