We all know how to keep our computers safe now, right? Install antivirus software and let that take care of you. Sit back, browse and download to your heart's content and watch the little digital warrior in the bottom right of your screen shoot down invaders with robotic precision. But what happens when you forget to update and something sneaks through? Or, perish the thought, you forgot to install the software in the first place? Now you're in a predicament. Surprisingly, not many people know how to cleanse their own computer after a successful virus or malware infection. ...