Yesterday I spent the day setting up from scratch, a friend's new PC including the ADSL connection, and all was working fine when I left him last night.
However this morning he phoned me to say that it looks as though the PC has a virus as nothing loads and it keeps on switching off. I installed Avast anti-virus as well as ZoneAlarm firewall but he tells me that he is unable to access any of these programmes as even the desktop will not boot up. The OS is Vista premium.
Thank you for your reply but he says that when he switches the PC on the desktop is blank, with no icons and it tries to load something that he hasn't heard of, and last night he said the machine was getting very slow.