Don't like the way Windows works? Who does? But just because the operating system doesn't look and work the way you want doesn't mean that you're stuck with it as is. Windows is extremely tweakable; if you dig a little, you'll find that you can customize it in almost any way you want. To help you out, we've put together this guide to tweaking Windows. It covers both XP and Vista and lets you do all kinds of things you might have thought were impossible -- replacing your boot screen, tweaking the Control Panel, speeding up Windows Flip 3D and more. Look for the XP logo and Vista logo icons to see which tips work in which OS.