Hope it will help.If you have an earlier version of Office installed on your PC and you install Office Home and Student 2013, Office Home and Business 2013, Office Professional 2013, or Office 365 Home, you won't have an option to upgrade over the previous version. Instead, you'll have both the new version of Office and your earlier version installed on the same PC. If you don't want both versions, you should uninstall the earlier version through Programs and Features in Control Panel.