Have you tried:-
Connect your PC via ethernet to the router. Connect the printer to that pc check it is working correctly on that pc.
Then: 1. Got to control panel 2. Click printers and Other Hardware 3. Click view installed printers 4. Highlight the printer 5. On the left pane click Share this printer 6 Follow all instructions
You will need to have the printer installed on all pc's.
When completed you should be able to use the printer on all pc's attached to your network (the printer will now be connected to the router only.
If you have a pc attached to a router then you have set up a network.You do not say the OS of your pc but it is possible to set up a workgroup with pc's with different OS. This can be explored if you have problems setting up the printer on your router.