It would seem Microsoft is ever looking for more creative ways of pushing its Windows 10 operating system towards the masses. Some Windows 7 and Windows 8.1 users have apparently encountered one of these: a lock on system updates. The error message, which reads “Your PC uses a processor that isn’t supported on this version of Windows”, points towards a hardware lock-in in exchange for added security and updates.
A Microsoft Support page sheds some light on this issue: that Windows 10 is the only Microsoft operating system to support particular hardware configurations. Namely, systems based on Intel’s “seventh (7th)-generation processors or a later generation” (Kaby Lake); “AMD seventh (7th)-generation (“Bristol Ridge”) processor or a later generation”; and “Qualcomm “8996” processor or a later generation”. This move on Windows 7 might make some sense; however, Windows 8.1 is still in its lease of life (and Microsoft support) until at least 2018.
Source: Microsoft Support