If you've been using computers a long time, you can remember the days when you needed the keyboard for everything. Some of us have never given up the habit, and still use keyboard shortcuts in Windows with great regularity. Depending on what you're doing, they can really speed you up. So if you've either bought a new system using Windows 7, or if you've bought the OS and installed it yourself on a computer you already have, you may be wondering what new keyboard and mouse shortcuts on it can make your life easier. Here's a look at 12 of them.