ubun2

i installed ubuntu with my windows 7 , everything is fine but i m not able to connect my airtel broadband to it, i have a dsl modem with airtel connection, someone plz help 

I don't know a lot about this but I have just installed Ubuntu 10.10. I had the wired connection working then it just went after downloading something from Ubuntu Tweak.

Now there is no connection available and it just says Wired Network disconnected. I have tried to manually put the information in but this doesn't seem to work either.

Any Ideas?

Thanks Dave