lose the net in fedora
 

I am in the UPC cable network, in Romania. I have a AMD 64 Athlon computer and have installed on it win XP and fedora 7. When I installed Fedora, everything was OK with my network, I was able to use it for yum (I installed adobe reader, xnview, vlc, etc, valknut, etc). In the last week I have not open fedora, only win. Now I entered in fedora and I see that the net is not working anymore ! I have 2 broswer (one is firefox) but they are not working anymore ! In win everything is ok !
Do anybody have an ideea of what could happen ?
In win I use also an DC++ client - could it affected fedora ? I can't imagine that, but...
Thank you all !

duplicate thread: http://www.linuxquestions.org/questi...d.php?t=588159