Thanks once again for the advice - although I couldn't get Start Page Guard to install, there was a link to a spyware site. That site reccomended Spybot which looks as though it has done the trick. Hooray!!
I was so impressed I made a Pay Pal donation of five dollars to the German bloke who produced the programme (last of the big spenders, me...)
http://security.kolla.de/index.php?l...&page=download