Which version of Windows operating system am I running in Windows 8.1 or Windows RT 8.1?

Find operating system info in Windows 8.1 or Windows RT 8.1

To find out which version of Windows your device is running, press the Windows logo   key + R, type winver in the Open box, and then select OK.

If your device is running Windows 8.1 or Windows RT 8.1, here’s how to learn more:

1. If you're using a touch device, swipe in from the right edge of the screen, tap Settings, and then tap Change PC settings. Continue to step 3.

2. If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, click  Settings, and then click Change PC settings.

3. Select PC and devices > PC info.

4. Under Windows you'll see which  edition and version of Windows your device is running.

5. Under PC > System type you'll see if you're running a 32-bit or 64-bit version of Windows.