I hate those viruses that always ruin your computer and your day. 
  
Today, I got attacked by PERFECT DEFENDER, a virus that acts as a normal Windows security update. By downloading the security update (e.g. virus), the program will make every web page you visit a threat, saying this page is dangerous and could infect your computer with a virus, and then crashes the web browser. 
 
Very cheeky. 
 
Luckily, I have adapted to these viruses. Everything I download I save on a physical disk, and I can return my computer to it's factory state at a moment's notice. I quickly saved the videos and the game I was working on, and pressed the big red reset button. Up yours, virus! 
 
Right now, I am on another computer, but my laptop should return as new as it was when I got it (as in outdated) shortly. Hurray for me! 
 
What do you do to combat viruses?