Your PC is watching you - and carefully taking notes. Launch an application, open a file, tweak a setting, visit a website, just about everything you do gets recorded by Windows and your applications, and saved in a list somewhere for later use.In some cases, of course, this is very obvious. You probably know that your web browser holds all kinds of details about recent internet sessions, for instance, and if you're unhappy about this then you can generally clear most of them in a click or two.But other tracking technologies are far more obscure. For example, did you know that Windows maintains a detailed record of the programs you launch, how often you run each one, when a program was run last, and how it was used?