When you install Microsoft Excel, you have a choice to also install some of Excel’s add-ins, such as the Solver tool. These add-ins are stored in Excel but are not available from the menus until you activate them. Before trying to locate your installation disc, try activating the add-in you need through the Excel Options screen. If the add-in does not show in the Manage drop-down list, you will need your Excel installation disc and can easily install the add-ins you need by following the on-screen instructions. Writer Bio
