I've looked around at some things and in windows xp you should try this:
Go to control panel,
go to networking,
right click on the connection you are sharing (on all your computer),
click on the networking tab and click on Internet Protocol (TCP/IP) and click properties,
make sure that the option box "Optain IP address automaticly is checked".
Also in the list of networking properties, make sur that File & Print sharing for Microsoft Networks is checked...
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