BleepingComputer.com: Internet Connection Problem

I was uploading AVG to get rid of a trojan horse virus on my laptop computer when my internet stopped working. I am in a flat with other wireless internet users whose internet connections are still fine. I have tried to diagnose the connection problem myself and it suggested there was something wrong with my firewall settings. On my network connections page it says the wireless is connected but it also says that connection is firewalled. I have been onto my firewall settings but don't understand what the problem is. Any help would be much appreciated!!

Log on as an administrator, go Start > Run and type: "cmd". In the window that appears type: "netsh winsock reset". When the program is finished, you will receive the message: "Successfully reset the Winsock Catalog. You must restart the machine in order to complete the reset." Close the command box and reboot your computer.

Go Start > Run > type: "cmd" In the window that appears type: "ipconfig /flushdns". Close the command box.

Go Start > Control Panel > Network Connections. Right click on your default connection, usually Local Area Connection or Dial-up Connection if you are using Dial-up, and and choose Properties. Double-click on the Internet Protocol (TCP/IP) item. Select the radio button that says "Obtain DNS servers automatically". Reboot.

Warning: Some Internet Service Providers need specific DNS settings. You need to make sure that you know if such DNS settings are required before you make this change.