[. . . ] You cannot use an upgrade version of Windows.
 A blank CD or DVD, or an external drive formatted as MS-DOS (FAT).
After you install Windows, you need to install software drivers that let Windows work with your Mac hardware. You can download the drivers to a blank CD, blank DVD, or external drive. To format an external drive as MS-DOS (FAT), use Disk Utility in the Utilities folder. [. . . ] To install Windows on your Mac computer: 1 In the Windows 7 installer, follow the onscreen instructions, until you're asked where to install Windows.
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2 When you're asked where to install Windows, select the partition named "BOOTCAMP. " NOTICE:Do not create or delete a partition, or select any other partition. Doing so may delete the entire contents of your Mac OS X partition.
3 Click "Drive options (advanced). " 4 Click Format, and then click OK.
5 Click Next. The installer formats the Windows partition using the NTFS file system. 6 Follow the onscreen instructions to finish installing and configuring Windows. After you install the Windows software, your computer automatically restarts using Windows. Use the Windows setup screens to configure Windows.
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If You Have Problems Installing Windows
If you have problems installing Windows, try the following solutions. If you get a message saying "Installer Disc Not Found" when installing Windows Make sure you're logged in to Mac OS X as an administrator. If Windows didn't install properly Verify that you're using an original, full version of Windows 7 Home Premium, Professional, or Ultimate. Restart your computer and hold down the Option key until one or more disk icons appear on your screen. Insert the Windows installation disc into the optical drive or insert the USB flash drive with Windows 7 into a USB port on your computer. Select the Windows installation disk icon and then click the arrow beneath it. If the Windows installer isn't responding Be sure you are using the original keyboard and mouse that came with your computer. If you're using an Apple mouse, the Windows installer may not respond if the mouse is connected directly to your computer. If you insert the wrong disc during installation Eject the disc by holding down the Eject key on your keyboard, the button on your mouse, or the button on your trackpad while restarting the computer.
Step 4: Install the Windows Support Software
After installing Windows, install Mac-specific drivers and other support software for Windows. The support software installs Boot Camp drivers to support your Mac's hardware, including AirPort, its built-in camera, the Apple Remote, the trackpad on a portable Mac, and the function keys on an Apple keyboard. The software also installs the Boot Camp control panel for Windows and the Apple Boot Camp system tray item. To install the Windows support software: 1 If you can't find the CD, DVD, or external disk with the support software you downloaded, open Boot Camp Assistant and download the software again. You can quit the assistant after you save the software without creating a new partition.
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2 Insert the CD or DVD or connect the external disk with the Windows support software. [. . . ] If your computer has multiple disks and you installed Windows on a disk that has only one partition: Start up in Mac OS X and use Disk Utility, in the Utilities folder, to reformat it as a Mac OS X volume. 2 Quit all open applications and log out any other users on your computer. 5 Do one of the following:
 If your computer has a single internal disk, click Restore. [. . . ]