Problems with setting up home network

hi, i have a billion 5100 4 port router and have been trying to setup a home network - with the desktop computer and laptop, but it doesn't seem to work. I can share internet connections(i just plug the network cables in and it works - no setup) but cannot share files or the printer. I have tryed to place them into the same workgroup but the computers still doesn't reconize each other. would it be something to do with the router-like a configuration i need to do.
i also have norton internet security 2005, but have tried turning it off and still ins't networking properly.

hmm... can u provide a more indepth? i've tried putting files/folders on sharing, same workgroup n all, but the router still doesn't detect anything.

where do you go to input the IP addresses? is it them options available on the left bar in the "network connections"? (e.g. 'create new connection' ..'setup home or 'small office network' ..etc) as i tried them but they didn't work still.

where do u configure the subnets?