Not reading anymore

The only thing I can assume is the problem is is that the COM ports have become mixed up. I believe the scanner needs to use COM3 and it could be that this may be being used by another device. We had this problem a while back and no matter how many times we re-added the device it would take a COM port higher than 4 or 5 and not any lower. If you can reset all the COM ports and re-add the scanner device then that should work.