[Adam]

Which folder do you put the brushes you've downloaded into for PS7? I've looked for a brushes floder but I can't find one.

 

[Guitar Pl4yer]

Presets > Brushes. You usually have to unzip the files too.

 

[OlympicZero]

Just unzip them to your desktop. Then open Photoshop. On the little brushes pallette; click the little arrow at the top on the right and go to load brushes. Once you're done just delete the original thing.