Data Encryption

What do you guys use to encrypt/hide questionable files on your computer? I've got some crap I wouldn't like people on my house to find.

Also, what about covering internet tracks? How does one hide their activity from prying eyes? And I'm not talking about clearing history/cookies, I mean from people watching from the outside.

Well, I don't need "plausible deniabiliy," I don't have CP or anything on my comp. I just don't want people finding my Hentai/Ecchi collections.

I need an anonymizor of some sort because I HAVE stumbled onto some questionable shit here on 4chan and a few other chans, and I don't need people watching me do it.

Also, can you report stuff in the /rs/ directory? I downloaded a .rar that ended up being CP.