@kris11 - вероятна причина -> каша с node type. Пусни един "ipconfig /all" на всяко ПС и погледни какво пише срещу 3-ред на "Windows IP configuration" в резултата. Валидни са 4-ри конфигурации (b-node, p-node, m-node, h-node) - broadcast, peer-to-peer,mixed, hybrid ), както и обичайното unknown. как се променят те -> http://support.microsoft.com/kb/903267/
NodeType
Key: Netbt\Parameters
Value Type: REG_DWORD - Number
Valid Range: 1,2,4,8 (B-node, P-node, M-node, H-node)
Default: 1 or 8 based on the WINS server configuration
Description: This parameter determines what methods NetBT uses to register and resolve names. A B-node computer uses broadcasts. A P-node computer uses only point- to-point name queries to a name server (WINS). An M-node computer broadcasts first, and then queries the name server. An H-node computer queries the name server first, and then broadcasts. Resolution through LMHOSTS or DNS follows these methods. If this key is present, it will override the DhcpNodeType key. If neither key is present, the computer uses B-node if there are no WINS servers configured for the network. The computer uses H-node if there is at least one WINS server configured.