^ +1... This is SO true. Linux has been great for me so far, but unless you have someone to teach you all the stuff, you won't figure it out. How about emacs and its horrible-mapped shortcuts? (Press CTRL+X and then tap H to... select everything, and I still can't remember how to copy selected texts... lol) Or the "cat" command that does a whole bunch of different things (crunch files together, create new text files, etc.)?
Unix is great, but not so popular exactly for that reason - most of these things can be done through the GUI in Windows, and those that can't are not needed for an average home user. Thus Unix dominates servers, and Windows took over personal computers.
Best security suite: some brain. Don't connect to the Internet unless you need to (aka switch off the net PHYSICALLY when you don't need it), switch off Autorun (done in 10 seconds once and forever) for all drives, and don't click on stupid links. You're good to go. I'm not running any antivirus software, and if I install one, it finds no issues. As it was said before, security vulnerability #1 is between the keyboard and the chair.