Summarize:

Click the Windows logo in the bottom-left corner of the screen. This will open the Start menu. Type in command prompt into Start. This will bring up the Command Prompt app icon at the top of the Start menu. Right-click {"smallUrl":"https:\/\/www.wikihow.com\/images\/6\/66\/Windowscmd1.png","bigUrl":"\/images\/thumb\/6\/66\/Windowscmd1.png\/36px-Windowscmd1.png","smallWidth":460,"smallHeight":383,"bigWidth":"36","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Windows icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"} Command Prompt at the top of the menu, then click Run as administrator and click Yes when prompted. Type in ffmpeg -version and press ↵ Enter. This should bring up a list of information about FFmpeg. If you instead see the phrase "'ffmpeg' is not recognized as an internal or external command, operable program or batch file" appear, you may have misspelled the path name.
Open Start . Search for Command Prompt. Open Command Prompt in administrator mode. Check your FFmpeg version.