You say you are connected to the internet with an excellent connection, but you can't browse. This doesn't make sense. Can you explain this? Can you use any internet related programs like FTP, email client (like thunderbird), or usenet at all? In other words, how do you know the connection is excellent if you can't get online?
You might have a connection to other computers on your home network, but it sounds like you are restricted from the internet.
Your best bet is to go into your TCP/IP settings and make sure that "obtain an IP address automatically" and "obtain DNS automatically" are checked off.