From the list below, click on the Operating System that is installed on the newest of your computers.
If you are on another computer and need to know what Operating System is installed on the computer you are trying to setup file and printer sharing, press and hold the Windows Logo key
then press the <Pause> or <Break> key (on notebooks it may necessary to press and hold the <FN> key before pressing the Pause or Break key). The System Properties window will open and the Operating System is listed.
Some newer notebooks no longer have a Pause or Break key.