[ubuntu] Can't connect after connecting to a wireless router

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http://ubuntuforums.org – I have very little understanding (ok no technical ability so be gentle) Ubuntu 10.10 connects to a DSL modem without any problems - I mean I just plugged it in and it worked - GREAT I bought a wireless router so I could connect my netbook and now my Ubuntu machine which is simply using a cable from the wireless router now DOES NOT connect. I tried a windows machine on the wired connection from the wireless router and it connects without a problem. OF course if I remove the wireless router from the chain, i.e. simply connect directly to the modem it works straight away. I guess I have cove (HowTos)