He's a list of free art programs for you to use! None of them have viruses; I've used them all at one point of my life or another.
Note: To open some of these, you'll need WinRAR. It's free, and even after the 'trial' expires, you can still use it to open RAR, ZIP, and many other files.
WinRAR: http://www.rarlab.com/download.htm
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When it comes to art quality and style, a lot of older artists say "It's the artist, not the program.". On the contrary to what they say, the program DOES play a LARGE part in what your art looks like.
New programs open up opportunity for improvement! Heck, when I first used Paint.N