Note: Make sure that you are logged in with Administrator privileges.
Right-click the following link and choose the option to save a linked file: Arrows.csh. (Depending on the web browser, this option can be called Save Link As, Download Linked File As, Save Target As, or something similar.)
Save Arrows.csh to the following folder and overwrite the existing file:
The Arrows.csh presets file installed with Photoshop Elements 9 and 8 is missing many of the arrow shapes. The attached copy of the file restores all of the arrows.