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Thank you so much for your help methyl, I really appreciate it and have passed your reply on to my brother who is trying to help me too.
Further info for you methyl - I use Windows XP and the first I knew there was something wrong was yesterday morning when I went to my In Box to read my emails and a message appeared that said something like Outlook Express was not closed down correctly and to click here to read last message. When I clicked that link, all I got was the "Eggtimer" and the screen froze up. I had to do Ctrl, Alt Del to come out of Outlook Express but I could not get into Google either. All I could do was get into all my clean up progs (described above) which had been saved to my Desktop, but despite running them all, nothing could be found. I tried FixVundo today to get rid of possible Trojans but none found. Thanks.