Open any Excel document.
Navigate to the "Tools" menu. Click on "Add-Ins."
Select the check box next to Analysis ToolPak under "Add-Ins." Click "OK."
Click "Yes" to install Analysis ToolPak if you see the message "Analysis ToolPak is not currently installed on your computer." Analysis ToolPak will be installed.
Click on "Tools" under the menu bar. Open a new Excel document. You will see that the data analysis command listed, which indicates the program has been added properly.