In "Control Panel > Printers", check in the printer's Properties that it is set to use the correct port. It should be using something like:
Port - "USB001"
Description - "Virtual printer port for USB"
If, at the time of installing the software, it couldn't find the printer on a USB port, it may have defaulted to installing on the Parallel port - LPT1, so that it needs to be changed to the USB port.