I upgraded to Windows 10 on a server computer (the one which has two printers connected to) and none of the other three computers on the network (all three running Windows XP) can connect to it. Downgrade back to Windows 8.1 and boom the computers can connect to the printers like a charm. Everytime I try to connect to the printers from the other computers it asks for a username and password and no matter what combination I enter it refuses to connect. I even disabled password protected sharing and set up a new network, deleted and added the printers and what not. Just refuses to connect. Wondering if its the incompatibility with Windows XP that is refusing to make it work.