Hello, Thom & Joanna Deane.
Your best bet is to unplug the printers power cables, and uninstall the HP printer software along with the Epson printer software on both computers. Now reboot your computers and make sure they are both up to date.
Make sure both your computers and printers are on the same wireless network or if your PC’s are on a hardwire connection make sure your printers are on your primary wireless network and not a guest network.
Download your printer’s drivers. & install them, if there is any issue with the software install and finding the printer then something is wrong with your network.