[ubuntu] Lost network connection

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http://ubuntuforums.org – I trialled Ubuntu 10.0.4 via my CD yesterday and managed to connect to the internet. When I next started Win XP I found that I had lost my network connection. The card does not show in device manager so I finally installed a new card to try to solve the problem. Although this one is recognised by the device manager and I can set up a LAN, I still cannot get online. It's not a problem with the broadband router or the isp as I can connect wirelessly with my laptop. Any suggestions as to what may have happened or is it just coincidence? (HowTos)