What we going to do is make sure now that all of the computers on the home network are set up to receive information from the router. To do this, the network adaptor in each computer connected to the router must be set to 'obtain an IP address automatically'.
For Windows XP systems, go to start > control panel > network and Internet connections > network settings.
Right click the connection and hit 'properties',
Then highlight TCP-IP settings and hit the 'properties' button
Select the 'obtain an IP address automatically' and 'obtain a DNS server automatically' options.