No MIDI input device in Sonar! Help!

[CAMARGOX50]

Hi experts! I have searched several forums, manuals, tutorials and couldn't find an answer (probably because I am fairly new to this world of MIDI, Sonar, vst, etc.)

I use Sonar 8 Producer Edition (x64) with my keyboard Korg x50 connected to my PC via USB cable that came with the keyboard. Sonar recognises x50 and I can send MIDI data and play live using vst plugins.

I just bought a MIDI->USB cable/interface. I installed the driver for Windows 7 64-bit as per cable manufacturer instructions. I am trying to use a piano Kurzweil SP88 to send MIDI signal into Sonar and use softsynths/vst going out as audio to my M-Audio Fast Track. I can send and receive MIDI using software Encore (just an example). I ran a test application and could send and receive MIDI as well.

However when I open Sonar (with the cable and piano connected), there is no MIDI input device to be selected from the list. The list is empty. So I guess Sonar does not recognise the cable+piano although Windows (and Encore) do. Does anybody know how to make this MIDI-USB interface (connected to the piano) appear as a MIDI input device in Sonar?

I have tried:
- Uninstall and reinstall the cable driver
- Change Driver Mode from WDM/KS to ASIO (I have ASIO4ALL installed)
- Change Driver Mode back to WDM/KS
- Clean Windows registry removing repeated drivers (for example driver for Korg x50 appeared 3 times) as I read in forums that there is a limit of 10 MIDI devices installed in Windows 7

My config:
Dell Inspiron INSP1440
Pentium(R) Dual-Core CPU
4Gb RAM
64-bit operating system
Windows 7 Home Premim
M-Audio Fast Track audio interface
MIDI-USB cable Prelude with drivers for 64-bit (manufacture states it is Windows 7 compatible)
Sonar 8 Producer Edition(x64)

Tks a lot! Sorry if this is a stupid question! Sorry if too much unnecessary information! Sorry if already responded somewhere in the forum and I couldn't find it!