Alternative methods. Below are some additional methods of determining the version of Windows. 1  Right-click on My Computer on the Windows Desktop or in the Start menu. 2  Select the Properties option. 3  In the System Properties window, as shown below, the version of Windows and the Service Pack (if installed) is displayed.indows on mobile devices. If you're running Windows CE on a mobile device such as a cell phone or PDA, you can determine the version of Windows CE by following the steps below. 1  Click Start, Settings, and then Control Panel. 2  Click the Systems Icon.