The internet connection I have periodically hangs. To insure you have as much info as possible I've created http://www.promonmc.com/_network/
which maps out the network and its settings.
If I unplug the Linksys router for a few seconds the internet begins responding again. Sometimes if I wait more or less 5 minutes and no internet access is attempted Xp Laptop will begin talking to the internet again, other times this doesn't seem to work. Of course if you need more info I can provide it. In the diagram I've not provided the settings for "W98 Laptop" since it doesn't matter if it is on or off, the internet still hangs.