jeanette...

Because that tool doesn't really work. Like Ronny and I said, duplicate the image first, apply blur to that layer, and a layer mask and paint on the mask where you DON'T want to be blurred. ...

If you make a quick call to Adobe they will help you with re-activating the program on your computer. Also, Adobe does provide a greatly reduced priced program if you are a student. However, if...

First, create a duplicate layer then blur that layer. Next, blur that layer. Now add a layer mask and paint over the to reveal the areas you don't want blurred. Flatten and you're done. --