With the Windows 10 system is different, Windows 7 system and no built-in security products, but for these users do not upgrade to Windows 10 system, Microsoft provides a free Microsoft Security Essentials.
When Microsoft released a new update Microsoft will check the registry for the key, the current Windows 7 system if you want to continue to get updated so there are two solutions, either install antivirus products or go to the registry to create the key value. Users can go to the Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\QualityCompat path and create a new DWORD (32-bit) key named cadca5fe-87d3-4b96-b7fb-a231484277cc with a value of 0.
As for the non-support list of security products that prevent Windows 7 from receiving updates, Microsoft itself does not provide detailed instructions. However, the current mainstream anti-virus software has been upgraded to compatible with the Windows 10 system in this strategy, so I believe that the strategy deployed in the Windows 7 system will have manufacturers follow up.
Windows 7 will continue to receive updates until January 2020, and acceptance of updates for users who are still using the system is critical.