[ubuntu] No more internet connection

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http://ubuntuforums.org – Hi, I've installed Ubuntu 10.04.01 with Wubi. Everything worked correctly untill I have updated some programs, than I can't boot, so I removed totally Ubuntu than I've installed it again. Now I can't connect internet, but I don't have any problem doing it when I boot in windows, and I remember that the first time I used Ubuntu it was all automatic and it connected without problems. Now it doesn't give any error just goes on asking me the password (I'm sure that the password isn't wrong) What should I do? Do you need other informations? Thank you!! (HowTos)