Microsoft

Starting this month, Microsoft has stopped delivering updates for Windows 7 and 8.1 operating systems running on modern processor models, such as Intel 7th Generation (Kaby Lake) and AMD 7th Generation (Bristol Ridge).

Microsoft says that support for new CPU models will only be provided for Windows 10, its latest OS, and not Windows 7 and 8.1, which are approaching their end-of-life.

Microsoft warned PC owners last year

Microsoft announced its intentions in January 2016, and then in March and August of the same year. The company never announced a specific deadline for this move, and even if a support topic popped up online in March 2017, this month's Patch Tuesday caught many PC owners by surprise.

This month, updates for Windows 7 and 8.1 users on newer CPUs display the following warning:

Your PC uses a processor that is designed for the latest version of Windows. Because the processor is not supported together with the Windows version that you are currently using, your system will miss the important security updates.

After this month's updates, Windows 7 and 8.1 users will receive one of the following errors when scanning or attempting to download Windows updates.

Unsupported Hardware
Your PC uses a processor that isn’t supported on this version of Windows  and you won’t receive updates.

,or:

Windows could not search for new updates
An error occurred while checking for new updates for your computer.
Error(s) found:
Code 80240037 Windows Update encountered an unknown error.

Owners of the following 7th generation CPU models are known to be affected: Intel seventh-generation processors (Intel Core ix 7xxx), AMD “Bristol Ridge/Ryzem/Zen,” and Qualcomm “8996.”

This doesn't mean Microsoft will support all older CPU models on Windows 7 and Windows 8.1 either, as the company currently lists 16 OEM vendors for which it will support Intel's 6th generation of processors, also known as Skylake.

For owners of newer CPU models still running Windows 7 and 8.1, the Redmond company recommends they update to Windows 10.