It sounds like a network configuration problem. First make sure all the boxes are updated to XP SP1. Since it's peer-to-peer there's no definite server/browse master on the network so it's important to follow the instructions in
http://support.microsoft.com/default.aspx?scid=KB;en-us;318030&Beyond that, try the normal stuff:
- disable any antivirus product that may be running
- see if the problem is specific to one machine, or to all
- simplify wherever possible
Regards. Al
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