If you find yourself needing an operating system that respects your privacy, you cannot go wrong with Tails. The live Linux-distro can be run from a DVD which is read-only, meaning there is less of a chance of files being left behind. Heck, Edward Snowden famously used it to protect himself when shining a light on the overreaching US government.
Unfortunately for some users, Tails will soon not work on their computers. The upcoming version 3.0 of the operating system is dropping 32-bit processor support. While a decline in compatibility is normally a bad thing, in this case, it is good. You see, because there are so few 32-bit Tails users, the team was wasting resources by supporting them. Not to mention, 64-bit processors are more secure too.