How to remove extra Checkpoint printers

Step-by-step guide

Unplug the USB cable from the printer. (If there are multiple printers plugged in, unplug them all.)
Hold down Windows key, tap R key, release Windows key. NOTE: If this does nothing, login as user "mp" - click here for instructions
Type in "control printers" (without quotes).
Click "OK"
Right-click on a printer. (Long-press on touchscreen)
Click/tap "Remove device"
Enter the MP username/password if prompted (won't happen if you're logged in as MP)
Repeat step numbers 5-7 for ALL printers.
Plug in the USB cable to the printer you want to use.
Confirm the printer automatically adds itself within 1 minute, and shows up in the Printers window.
Right-click (or long-press) the newly-added printer, and select "set as default" (if it's not already selected)
If you get a pop-up, click OK:
Reboot the computer and try checkpoint printing again.