You’ll need a computer running Windows 7 or Windows 8 to install Microsoft Office 2013. If you try to install Office 2013 with Windows XP or Windows Vista, it just won’t work. If you start to install Office 2013 on Windows XP or Windows Vista, you’ll see one of the following messages:
This is not a valid Win32 application
We are sorry, you couldn't install your Office product because you don't have a modern Windows operating system. You need Microsoft windows 7 (or newer) to install this product
Consider upgrading to Windows 7 or Windows 8. Or read more about Office 2013 requirements.