|Open a command prompt window (Start >> Run >> type cmd and hit Enter) and type the following command:|
Post the results in a reply in here. Since you're connected directly to your modem, just post the first two octets of your IP and use x's for the rest (ex: 212.149.xxx.xxx) It's always best not to post your complete external IP address. There's no point in asking for trouble right.
Just an FYI, you might want to consider buying a SOHO router. They're relatively inexpensive (around $40 - $50 US) and will provide a firewall, NAT and DHCP so you can connect multiple computers safely (the firewall right) to the internet.