The document provides steps for installing the Analysis Tool-Pak and MegaStat add-ins in Microsoft Excel 2007. To install Analysis Tool-Pak, users select the Add-Ins option from the Excel Options menu, check the box for Analysis Tool-Pak, and click Go. This makes the Data Analysis command available under the Data tab. For MegaStat, users extract the downloaded file to their hard drive, double-click the MegaStat.xls file to load the add-in, and enable macros to access MegaStat under the Add-ins tab.