If you're really paranoid about viruses...

[Pogi]

If you're really paranoid about viruses, trojans, etc. formatting your drive, rename format.com and fdisk.exe. All you need to do is change the extensions.

[Gabriel]

Hea, Hea...
Just dont Start the Computer...
:D

[NeoNexus]

Just follow a few simple rules and you`ll be fine

1) Install a good Virus scanner(Norton, InoculateIT, etc) and keep it up to date!!
2) NEVER run executable files that come from a source you don`t trust, and even if you do scan them first.
3) Install a firewall (ZoneAlarm, Tiny are good)
4) If you use Express make sure all unsafe content is disabled and be careful with email address you do not know.

Anyone add some more?

[GOVTECH]

So many people install them and think they don't ever have to touch it again. Wrong keep them up to date or it will do no good.