In my office there are two computers with Win-XP as OS; both are connected by LAN. Just two days ago both were communicating fine. But now whenever I am going to MY NETWORK PLACES of one computer to access the other one, the other computer is shown in the VIEW WORKGROUP COMPUTERS but the individual drives of the other computer are not accessible---it says:"\\(Comp. name) is not accessible. You might not have permission to use this network resource. Contact the administrator of this server if you have access permissions. Logon failure: the user has not been granted the requested logon type at this computer". Same problem is showing on both the computers. All the drives of both the computers are properly shared. What may be the possible problem?