After thinking I had a faulty wireless router, I now realise the problems could have been something to do with Zone Alarm. I no longer use Zone Alarm but do use Avast - has this had similar problems to the Zone Alarm problem which instantly halted internet connections?
Now, when I open up internet explorer it comes up with a white error page BUT I can connect to Broadband by going into the Start Menu, then Connect To and then clicking on Tiscali Broadband. Will I ever be able to get it working like it used to again?!
I deleted the Windows Update of 9th July 08 - anything else I need to do please?