Recently, I bought a Lenovo Yogo Tablet with Windows 8.1 with Bing (Japanese Version). It also includes Microsoft Office Home & Business 2013. - I see that Windows has been automatically activated. - For MS Office, I entered the activation key included with the machine. The Office has been also activated. I upgraded the machine to Windows 10. I see that the Windows 10 edition is Home and it is also activated. Although I changed the interface language to English, during the shutting down, starting up, and windows updating (any activities outside the desktop environments), some Japanese words still appear. Therefore, I plan to have a clean installation of Windows 10 and Office 2013 (all English). I'd like to know how to do that without lossing the activation states of Windows 10 and Office 2013. Which editions of Windows 10 and Office 2013 should I use (I asked this because Windows 8.1 with Bing is special, I don't have any experiences with it) ? Please give me some suggestions. Thank you in advance.