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If a person purchases a second-hand computer that comes pre-installed with Windows 7 or if they have someone else install Windows 7 on their computer for them, they won’t necessarily know if the copy of Windows 7 on the computer is genuine and activated.Thankfully, Windows 7 users can validate the authenticity of any and all copies of Windows 7, and they can do so quite easily.
If the computer detects that the version of the Windows 8 installed is not genuine, then it does not allow to set the lock screen picture, and the account picture.
Check : remove and disable Windows 7 startup programs I would suggest you to buy genuine copy of Windows only.
But let say you are student and can’t afford that then you can still buy genuine version, as Microsoft have some student related offers too.
There are various activators that are available on the internet.
But the activators of Windows 7 and Windows 8 computer are different, so do not try to activate Windows 8 or 8.1 with a Windows 7 activator.