connection only at netscape O.o

hey all, I have a problem, my internet doesn't work on any of browsers except Netscape, I am not sure from the reason, but I've tried already "Opera, Firefox, Safari, Google Chrome, Internet Explorer" and nothing from them are working, it keeps loading, till it gives me that "error" of no connection, even that at MSN for example, I can use it, Yahoo, and other communicators.. I had a notification earlier about firewall, and backup, but I checked the firewall again, and nothing important at it, it was disabled like always, and I am using Avast Anti virus... so if anyone would help me, I would appreciate it, thanks in advance guys :)

P.S.: If I would try "system restore", would it work? or nothing guaranteed?