Hi Mike,
Did you try to restart the ADB server on the Windows PC after updating the adb_usb.ini file? The shell commands to do this are
adb kill-server
adb start-server
Also, did you verify that ADB is enable on your device under Setting->Applications->Development->USB Debugging?
Does the device show up in the Windows Device Manager as an "Android Phone" with correct VID and PID?
Oliver