I don't call the OS a third party service. As for your other stuff, if the software is directly related to what I'm trying to do, it's not considered "third party" for my argument. Thus java, Flash (btw, I'm not considereing web pages applications, though the requirement to have many plugins is not something I like), Foxit, and AV are not considered third party for this argument. Furthermore, if your ISP requires that you install extra software, get a new ISP. Steam doesn't help make my civ5 experience better; it's simply required. I will concede with Sandboxie, but note that I also use it for keeping my computer virus free and that it's not required.