With the holiday season come gifts. If you're lucky you might have gotten big-ticket items—like new PCs, loaded with Windows 7. And even if you didn't get a new PC, you might have gotten Windows 7 to upgrade an older machine. Finally, if you got around $100 in gift certificates you don't know how to use, you might buy Windows 7 for yourself, because it's an improvement over the Vista and XP—check out our Windows 7 versus XP and Windows 7 versus Vista performance tests. But owning Windows 7 isn't the end of the story—the more you know about this operating system, the better, more convenient, and safer your experience using it will be. Read this overview of our Windows 7 coverage to make the most of your new PC OS.