Can't Access Other Computer Over Network Xp Sp3

How do I access shared folders over network XP pro v2002 sp3.I set up a network and have a workgroup called Workgroup. when I go to "entire network"->microsoft windows network->Workgroup and attempt to enter a certain computer I receive the message:"\comp_3 is not accessible. Yu might not have permission to use this network resource. Contact the administrator of this server to find out if you have access to permissions.Multiple connections to a server or shared resource by the same user, using more than one user name, are not allowed. Disconnect all previous connections to the server or shared resource and try again."What should I do? I have already enable netbios in the tcpip for the LAN for both computers. I have put on a password for the user of the computer that holds the file and subsequently get prompted on the remote computer, but even after entering the username and password of the host computer I still get this message. What do I need to do to access filesfolders on another computer?