Tails is a version of Linux that's specifically designed to offer the ultimate in privacy and anonymity. Download it, burn it to a USB stick or a DVD, and you have a live operating system that you can use to boot any computer. It's built-in web browser ensures that everything goes via the Tor network. Emails and documents are automatically encrypted. When you turn off the computer and remove the Tails disk, no trace of your session gets left behind.
In fact, Tails stands for "the amnesic incognito live system", which pretty much sums up what it does.
If you're interested in trying it, head to https://tails.boum.org/install/win/usb-overview/index.en.html where you can download the latest version (3.5) that was released a few days ago. Be aware that the download is a rather hefty 1,800 MB (that's 1.8 GB). It's safe to try on any PC - simply remove the Tails disc and reboot in order to get back to Windows.
To use Tails properly, you'll want to burn it to a USB stick rather than a DVD, and then create a persistent storage area on that stick. This will ensure that you have somewhere to save files to when you're using Tails, and will effectively create a secure self-contained operating system that you can boot on any computer when you want to work in private. This is very handy if you often use computers in internet cafes, hotels and so on. The page at https://tails.boum.org/install/win/usb-overview/index.en.html explains how.
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