Eagerly waiting for Windows 10. During the time of upgradation, they said that one can save the whole process in a USB or DVD. In future if one wants to re install windows 10 then he can do it so by installing it from the USB/DVD. This is a super work done my Microsoft.
Also it will be always activated even if one re installs it, may it be a clean install too.
Also it will be always activated even if one re installs it, may it be a clean install too.