Even before the launch of Windows 10, Microsoft announced that it will be a free operating system. More precisely, those who have already installed Windows 8.1 or Windows 7 can upgrade for free to the new Windows 10. Many rushed to reserve the upgrade or look for installation solutions immediately after the release date. What the majority of users did not do was read to the end what is written in “Terms and conditions” of upgrade la Windows 10. More precisely, many imagined that if they have a Windows 10 or a Windows 8 with a pirated license with I don't know activator or serial key false, they will receive the new Windows 10 for free.
It wasn't really like that. Microsoft offers free new windows 10 for all those who they bought a laptop or a PC with an operating system Windows 8.1 or Windows 7 preinstalled / installed with license, and for those who bought a copy of Windows 7 or Windows 8.
So, those who upgraded from Windows XP or Windows Vista to Windows 10 and those who used a pirated copy of Windows 8 or Windows 7, had “surprise” so that after installation the message appears that I am using a copy of Windows without a license (Windows is Not Genuine) or receive the typical Microsoft message “You may be a victim of software counterfeiting.”.
What to do if your Windows 10 license/serial key is no longer active/validated?
Very simple. Whether buy a Windows 8.1 license, then upgrade or buy one licensed copy of Windows 10 for about $119.99.