If you have upgraded one of your machines to Windows 10, here's a few items to think about locking down. First, head to Settings/Privacy. There you will find no fewer than 13--yes 13--different privacy settings screens. The major settings are under the 'General' screen. The other screens are concerned with which apps can and can't access your calendar, camera, messages, microphone and so on. On the General screen, you'll see your Advertising ID. This is your unique ID number. Think of it as being like a web cookie and you won't be far wrong. It's used to identify you to Windows apps advertisers. So, for instance, if you're a big Dallas Cowboy fan, you can count on seeing ads for Cowboys gear. Microsoft claims it doesn't link this ID with your name, email address, or other personal information.