Time may be running out for your Windows 10 computer. After Oct. 14, Microsoft will stop providing free security updates for the operating system. First, you need to find out where you stand. The easiest way to do this is with Microsoft’s own tool.

This fall, Windows 10 will reach its end of life—at least, as defined by Microsoft. On October 14, the company ends feature updates to the operating system. Security and stability updates also become restricted—a potential liability, depending on the ...