Somebody still remebers me :-)

Anyway, you certainly do NOT have good habits on computer security, period.

Some viruses can be spread simply by visiting infected web sites (happened some well-known government and business web sites) or previewing emails in Outlook.

Even Apple shipped some iPods with virus pre-loaded :) So can we trust all the other downloaded files without scanning them first?

You wouldn't be so confident if you knew some facts.
Overconfidence, to me, is ignorance.