you could always shell to dos and try pinging hosts... first try your gateway... which will be your exact IP but the the last group of digits will be 254:

ie:

Your IP: 192.168.1.110
Your Gateway: 192.168.1.254

if you can't ping your gateway then it means you don't have a prayer of making a connection to the net...

if you can then ping yahoo.com or google.com or somthing like that.... the syntax is as follows incase you've never done this before:

at the c:\> type: "ping 192.168.1.254" or "ping google.com"

if it comes back with times then you are connected if it comes back as "Host Unreachable" then you have problems...