So I have this copy of PS7.

Anytime I go to select a new tool, say the brushes, the menu pops up that allows me to select either the brushes or the pencil (normally this would only happen if I right clicked it)
And I don't want the selection menu popping up. Is there a way to lock the tools?
I checked my mouse settings, and the buttons are correct, so I know it has something to do with photoshop.

If you could help me, that'd be great.