How do I install Windows 7?
First, use Software Update to ensure your computer's Mac OS X operating system, Boot ROM, other firmware and software are up-to-date before installing Windows 7.
You'll need both your Mac OS X v10.6 installation and Windows 7 installation discs. Here is the general process:
Install Windows 7 using the Boot Camp Setup Assistant (located in /Applications/Utilities), which partitions your hard drive and walks you through the installation process. The process differs depending on whether you are performing a new install of Windows 7 or an upgrade install from an earlier version of Windows (see Boot Camp Installation & Setup Guide for more information).
After completing the Windows 7 installation, install the Apple Boot Camp Windows drivers from your Mac OS X v10.6 (or later) Install DVD.
Upgrade the drivers to Version 3.1 with Windows Apple Software Update, or manually download them from here.