Thankyou again guys.
I went to the Microsoft site and downloaded the latest cumulative security update, hopefully that will contain what you said grounded?
Milo, Trend Micro got me to go to a link which ran a big scan and created a log; not sure if it was Hijack This or not - if that would be their normal procedure, I imagine so, but I don't specifically remember that name. They promised to get back to us within 48 hrs, so again, we'll see!
At least I've got a little bit of computer knowledge, but not enough to solve this kind of issue on my own - makes me wonder how people who just know it as a box they turn on and it does what it's supposed to, manage to go more than a day without having some big problem.