After the launching of Windows 8, Microsoft obtained a lot of unfavorable evaluations, So after this task of customers, Microsoft chose to launch Windows 8.1, It's an upgrade variation of Windows 8. buy windows 8.1 key is a combination of Windows 7 and Windows 8. If you are using Windows 7 or 8, You can quickly upgrade to Windows 8.1 without a product key, However if you are an older version of W