Well my first guess would be the router configuration conflicting with the computers.
Assuming you haven't done so already, try having the router assign IPs based on MAC addresses.
On a side note, I've never been able to get a win98 box to work for more than a week when it's on the same network as one with XP.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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