Sorry folks in my rush to post the note I forgot to give you all the info. I have a window appearing which tells me I have a "Trojan Horse Back Door Agent,2,H System volume information\_restore". And then a load of numbers, Its tells me to run AVG and when I do Im told no virus found. If I leave the computer on I get the window telling me about the Trojan. I have XP Home I have scanned again with system restore off but not yet tried it. Prof.