I have been drawing my stick battles on paper.. just need to make them come to life now. I need an animating software that won't fill my computer with viruses and is free, if you could help me I would really appreciate it :D

Pivot is free. It's simple to understand but tough to master. Instead of drawing your sticks- like flash- you create them in a stickfigure editor and animate them like skeletons. It's called pivot due to the pivots of the stick figures.

If you really want to draw though, try out EZtoon. It doesn't use colour and it's buggier than pivot, but you can draw.

I suggest Pivot too!
However, if you're looking for something a little more complex, then check out my post here:

http://forums.stickpage.com/showthread.php?83254-SmoothDraw-as-an-animation-program&highlight=smoothdraw+animation+program

It's alright if you choose not to follow it, because it is kind of a hassle. It does work though.

The Most Recent version of Pivot is my recommendation

Totally go with pivot. Just make sure that you decline the ask bar and all of the things it tries to get you to install!
Cheers!