To check which version of Java you're running, you'll need to use Windows 10's Command Prompt app. The Command Prompt can seem intimidating at first, but if you know what to type, you'll be fine ...

First, launch Command Prompt by either searching for it on the Start menu or simply launch it by Start+R and entering “cmd” and hit enter. Now, once Command Prompt loads. Type “java-version” into CMD, ...