There are two approaches to computer security:

Guaranteed Protection.
I guarantee that if your computer is never turned on it'll never be successfully attacked by a virus, trojan, spyware, worm or any of the other nasties. The alternative is to use your computer but to practice...

Low Risk Computing
There are several things you can do to make your computer more secure, but, just like a front door lock will keep some burglars out, you'll need window locks too, and you should probably put a lock on the garage door...

If you think you already have a problem have a look at "I have a problem"

In any event, work your way through the Step by Step guide.

Children
There are some basic measures you need to take to keep your kids safe on the internet.