PRO-135 PC Programming

I picked up a PRO-135 scanner from a friend. Good shape and it works. I picked up the programming cable from Radio Shack and installed the demo ARC135 software. I updated the drivers for the cable to the newest version and the computer sees it as COM3.



My problem is the computers I have installed the software/driver's on will not see the PRO-135 scanner. Every time I go to read/write the radio it says Scanner Cannot Be Found. AND I cannot see anywhere in the ARC135 software where I can change the COM Port settings.



Anyone able to help me out here?



Thanks!