I would like to know what Anti Virus system you use, and please tell me if its free or not. I just recently formatted my C:/ Drive (so everything I have is gone, but I backed up the things I needed aka iTunes

) on my home computer, and everything is brand new. I have a
**** load of things I have to update, and in the mean time look for software I may need.
I'm using Windows XP (Running SP2 right now, still updating

) Home Edition. If you need any more specs, just ask

P.S. Since we're talking about computers, what programs do you find very useful to you? (Gaming, Photo Editting Software, Speed up, etc.)
My list right now is CCleaner, this music amp thing for my music files, iTunes, TortoiseSVN, and more..