Where can I get basic brushes?

[EOEO]

All my brushes got disappeared somehow...  even the ones like [hard], [soft pressure opacity] and such:( Can you help me to get those back? the basic things!!

[Trevor.Dennis]

Select the brush, and right click inside the document window, and click on the little cog icon in the top right corner.

Or are you saying that there are no brush sets there?