[timrichard]

I see it said quite often that the Windows virus situation should be blamed on the sheer size of their userbase. I'm not convinced - I think a lot of it is down to Windows users traditionally running with Administrator/root privs the whole time. Historically due to Microsoft's fanaticism with backwards compatibility - nothing but root in MSDOS. It certainly isn't that way with my Macbook or Linux machines, although I am sometimes a little tempted to go passwordless in sudoers before sense prevails.