Actually checking the data that your copy of Windows is set to expire is ridiculously easy. Simply press the keyboard combination Windows + R in order to open the Run box (alternatively, go to Start > Run or Start > Search depending on your version of Windows) and type:
Click OK to continue. Windows will display the About Windows box on your desktop, providing information such as the version you’re running, which Service Pack is applied, the copyright date for your version of Windows, a link to the EULA (End User License Agreement) to which you agreed upon installation of the operating system, the name of the logged in user, and the physical memory available.
Alternatively, you can check the windows expiration date screen via Windows Explorer – simply go to Help > About Windows to acquire the same information.