Shouldn't be a DNS problem if the XP machine's IP is the default gateway. Make sure you haven't linked this PC throught to DHCP and has a static address, and the Default Gateway on all the other machines is this address. Check that the permissions for this share, is set to allow all the domain users access, not local / workgroup access.
Do you have an IP Range available?
I would of thought from a performance point of view, that a new router / adsl modem router would be a worthwhile expenditure.
Let me know if this provides assistance.
MartyMcFly
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