"Unknown" wrote in message
...
The point is very simple. If you keep your system updated, the firewall on
and
DO Not open unknown attachments you do NOT have to mess up your computer
installing AV programs.

You are missing the point entirely. How do you KNOW 100% that an attachment
you get from a KNOWN source is virus free without scanning it yourself? Your
KNOWN source may be infected without them knowing it - it happens all the
time!