I messed around a bit more (always a bad idea) and decided to reinstall everything. I promptly uninstalled my modem before realising I don't have the installation disk as I bought the pc with it already installed.
So I have two problems, one, no modem and two can't get onto the internet anyway.
I (foolishly) thought I had some idea of what I was doing, but evidently not. Can someone put me out of my misery! Thanks