There is no one definitive Windows 7 guide—it's a sprawling OS with a decades-long legacy, so nobody can cover it all. But with our powers combined, you're in good hands.
First Things First
We covered everything we could in Gizmodo's official eight-chapter mega-guide, so hit that up first. It's a hearty first course, and it's got everything you need to know—what's new from Vista, why it's worth the upgrade, and how to get started with it. Or as we put it then: