One other thing which may be a clue here. When the freezing happened last, I looked in Windows Task Manager and noticed that a file called pavfires.exe was taking up 97-99% of the CPU capacity. It turns out that this is part of my Pandasoft Antivirus software. Presumably it is checking for viruses, etc. in My documents. However, it's extremely irritating and I wonder whether anyone else has had this and, if so, how they have got round it. Or do i just need to be patient? Thanks, mercurius