photoshop tool not working

Try this:

Restore default preferences
Preference settings control how Photoshop Elements Editor displays images, cursors, and transparencies, saves files, uses plug‑ins and scratch disks, and so on. If the application exhibits unexpected behavior, the preferences file could be damaged. You can restore all preferences to their defaults.

Note: Deleting the preferences file is an action that cannot be undone.

Do one of the following:

Press and hold Alt+Control+Shift (Mac: Option+Command+Shift) immediately after Photoshop Elements begins launching. Click Yes to delete the Adobe Photoshop Elements settings file.
Go to Edit > Preferences (Mac: Photoshop Elements > Preferences > General), click the Reset Preferences on next launch button, and then click OK. When you restart Adobe Photoshop Elements, all preferences are reset to default settings.
A new preferences file is created the next time you start Photoshop Elements Editor. For information on a specific preference option, search for the preference name in Help.

from here:

https://helpx.adobe.com/photoshop-elements/kb/preference-file-locations-photoshop-elements.html

Moved to the Photoshop Elements forum.

It's really not clear if you're talking about editing a photo or editing a video, or if you're asking about Photoshop Elements (a photo editor) or Premiere Elements (a video editor).

If you can give us some details, we can direct you to the right resource. 

Hi

Hi , I've moved your post from the Photoshop forum to the Premiere Elements forum where you are more likely to get help relevant to your issue.

Dave

This is not the Premiere Elements Forum but the Photoshop (proper) Forum.