It's the "all other settings i know of is ok" part that is usually the problem.
Turn on file and printer sharing on all computers.
Add "NWLink netBIOS" protocol to each computer.
Have at least one folder in each computer shared.
Have "Use simple file sharing" turned on in Windows Explorer/Tools/Folder Options/View (it is usually the last item)
Give Windows at least 10 minutes to find everybody.
Don't know how to do one or more of the above items? Come back and say so, I'll show you how.