Using Window 7 32-bit (or 64-bt) I got the Unable to connect [SC-1] error. The fix for me was to unplug the USB wireless receiver (Logitech or Microsoft for keyboard and mouse) which interferes with communication between MX-900 software and the remote. Whenever I want to connect to my MX-900 I unplug the USB receiver and hookup a spare USB wired MS mouse. It might also be necessary to run the editor in administrator mode. Right mouse click "Run as Administrator."