For a long time, Truecrypt was your best bet. But this past week, when Greg, our I.T. guy at Team Expansion, recommended VeraCrypt, I became curious. Upon checking up on him, I found him to be 100% correct. The open source (and free) software, VeraCrypt…
https://veracrypt.codeplex.com/
should give you everything for which you’ve been looking: 100% security and safety for everything on your hard drive. In fact, it’s actually BETTER than Truecrypt ever dared to be. So if you need encryption (why wouldn’t EVERYONE want it?), you’re in luck!
There is a also a community who works on a fork of the now-discontinued TrueCrypt Project. It works already easily on Windows:
https://www.ciphershed.org/