You probably have a static ip address set on one of the pc's. The router is set to give out ip addresses automatically. If one of the pc's has a static ip address set,(within the range of addresses that the router is dishing out) then the router may try to give out that address, see that it is already in use, and produce the error.
This is easy to fix:
For xp:
go to the control panel, then to network connections. Right click on your network connection, and left click on properties. In the white area of the window that pops up, click on 'internet protocol tcp/ip' and click properties.
For vista:
Go to the control panel, network and sharing centre, then click on manage network connections, right click on your network adapter, left click properties. Click on internet protocol version 4 (uncheck version 6 if it is checked) and check for auto ip and dns just like in xp.
Both pc's should be set to obtain an ip address and dns server automatically. If there are numbers in either area, this is the problem for sure. Make sure both are set to get an address automatically, reboot router and both pc's and that should be the end of it :)
Please post a comment and let me know how you make out.
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