All I want to do is use brush tool in Photoshop CS !?

Ok, I’ve done this plenty of times before and it was working yesterday.
Simply clicking the eyedropper tool to get the matched color.
Then using “brush tool” to simply “color” or “paint” something out.

For some reason, all it is doing is giving me the brush tool and doesn’t let me “brush”. (Duh Yes, I am clicking the mouse). It’s aggravating me. I went through all settings trying to see if something is set and I can’t find anything wrong.

I have even restarted my computer and closed the image and tried it on other ones. And it is still doing it.
don’t want a new prog thanks. want this one working again.