Go to the device manager, with the cable plugged in, locate the device under Ports (COM & LPT). Should be USB Serial Port (COM?). Right click on it and uninstall. Unplug the cable and restart the computer. I like to use the graceful "shut down" process, wait about 30 seconds, and then power back up. Once the PC is up and running, plug the cable back in. The computer should detect new hardware and load the drivers. Once that is finished, start the EZ Scan software and try the Check for CPU update again.