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Puppy Linux was started 10 years ago by an Australian Electrical Engineer who believed that an operating system does not need to be as complicated as the mainly used Windows. He started with an inherently secure linux base and removed everything that was not applicable for home use. The result was a very fast small system that has no updates or virus checkers. It is designed for personal use and installs in a few minutes with the inbuilt ability for dual booting with Windows. I have personally used it as my main operating system for several years, always booting in under 20 Seconds and never slowing down. The only application that automatically updates is the Browser with the built in E-mail client. Puppy linux is a live CD that can be installed on a Flash drive or a Hard drive.