ISTR another poster with the same problem not so long ago. We need to know what operating system, and what version of Photoshop? Do you have all the Photoshop updates, and is your video card driver up to date (from the card maker's website).
1)Hold down mouse button for 2 seconds
2)right click on icon
3)use shift+keyboard shortcut
Any of these three should get you the tool you need. If not try resetting your keyboard short cuts.
If these don't help, then let us know and we can think of something else.
Edit: I am assuming you meant the toolbar tools.