Security rivals thermal paste as the most important thing you have to keep in mind when building or using a system. Every bit of software on your PC should be updated; every external access point into your digital life, closed.  There's no reason why you should be handing over the keys to the castle to random Internet strangers.  Powerful virus protection, a strong firewall, and a bit of common sense -- among other tricks -- will go far to preserve your fortress of a system.

Now that's all well and good for the desktop in your living room, but what about third-party machines?  We've all had to jump on a system over which we've had no control--no observance or administrative rights to ensure that every bit of the operating system checked out to ideal security standards.  You can always head over the falls in a barrel and type your passwords and login credentials blindly, with no foresight or worries that you're inputting valuable information on a potentially infected machine.  That, or you can do what I'd do: Make sure that your every keystroke and action is somehow safeguarded through the use of portable applications that you can carry on a storage device of your choice (cough USB key cough).

And that's exactly what I'll be exploring in this week's Freeware Files: Five awesome portable apps that you can carry with you to increase your security presence on a PC that isn't yours.  These aren't panaceas--you'll still want to be as critical and as cautious as you would previously.  However, they're a step in the right direction toward (hopefully) a data-leak-free lifestyle.