a photoshop problem...

Edit- this problem has been solved! Thanks a million!!

I am running Photoshop 7.0 and today encountered a problem I've yet to see. I am unable to access my brushes! When I chose the paintbrush tool, I can access the assorted brushes default only. When I click the arrow button to scroll through the list of other brush sets, the button depresses but nothing happens. I've tried restarting several times. I checked my Photoshop-Preset-Brushes folder and everything in intact. Has anyone else ever had this problem or can anyone help me solve it?

~ Missing her Brushes in NY.