A question about the default brushes.

This might sound like a pretty silly question... I was wondering how do you get your default brushes back? I just got sets of new ones, which I was adding them at the time, and I accidently replaced my old ones. I tried uploading all the files that I could, but I never got those Circle brushes back. I may have missed one, I was able to get the Square brushes, but not the ones that PS(7 in this case) came with. Are these in the same brushes folder? Or are they some where else? Do I need to download them to get it back?

Just click the right-pointing arrow as if you were loading new brushes, and click "reset brushes" that will load your default brushes back in.