Reply to Traktor.... why?

I am absolutely lost here....

I've tried every single traktor update since 2.1, and every time I get the same problem... every update on this computer (toshiba qosmio laptop, windows 7 64 bit) makes my S4 no longer recognized by Traktor. It will still detect the audio card just fine, and I can even use timecode with it, but it won't recognize the S4 as a controller. It doesn't show up as an option in the setup wizard (even though three NI controllers I've never used DO show up), and it doesn't show up in the controller manager as an in or an out.

I've uninstalled, deleted all traces and drivers, cleaned the registry, reinstalled everything (including S4 drivers), and still nothing. And I've done this with every new version after 2.1. If I reinstall 2.1, it works fine. Also, all versions work perfectly fine with the S4 on my other computer.

Any idea why this would be happening?

Thanks.