lawaly

My PC is connected to a lan, from every part of the lan, it require password for access and i did not provide any password for accessing my computer, at end the people can access, i change my ip, my computer name but remain unaccessible.So dear fereind i nneed help at this point to make my commputer avaible to every one on the group. Thank you for all of your sugggestion to solve my the problem.