Tiree Broadband

Try these steps first:

Re-boot your subscriber unit (turn it off, wait and turn it on again). You should have at least 3 green lights on your subscriber unit Power, Wireless Network and Ethernet(flashing)
Re-boot your computer
Is email working?/ Can you browse the Internet? If either email or the internet is working, but the other isn't then your broadband connection is working and you will need to check the configuration of the program that isn't working.

Re-boot your subscriber unit (turn it off, wait and turn it on again) particularly if there have been any power outages recently.
Check that your computer is not performing any background tasks (Windows Update, Virus Update etc.)
Remember, the network will get busy at popular times