Matt, could you re-run ipconfig, but with the /all switch (that is, ipconfig /all)? Also post that from one of the XP boxen.
Some things to check/verify on your LAN: 1- all machines belong to the same workgroup name? 2- all machines have a unique name? 3- all XP machines have File and Print Sharing enabled, and listed as an exception in their firewalls? 4- ICMP (ping), outgoing echo response, is listed as an exception in the firewalls of the XP machines? 5- the Win7 machine's network config is set to Home (shown & changeable in Network and Sharing Center)? 6- have you installed the LLTD Responder on the XP machines? (note that if any are SP3, and LLTD has not been installed, it'll need to be requested as a Hotfix, as described in KB922120.) -Chris
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