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a choice. Otherwise, you’ll see a menu of installed operating systems, from

which you can choose the OS you wish to use.

To set up a dual-boot system, you’ll need at least two partitions or two physical

drives: one for each operating system. Install the first OS on any drive you like.

Then, during Windows 7 setup, when you see the “Where do you want to

install Windows?” page (Figure 1-2, shown earlier), just select the empty drive,

and setup will do the rest.

See Chapter 5 for more information on partitions, including

a way to divide your current single-partition drive into two

partitions without having to reformat.

In most cases, the boot manager of the most-recently installed operating sys-

tem is the one that will be used for all your operating systems, so the sequence

in which you install your operating systems is very important. Most of the time,

you’ll need to install older operating systems before newer ones. For instance,

on a PC already running Windows 98, just install 7 on a different drive, and

voilà: you’ll have a functional dual-boot system.

Some other operating systems, such as FreeBSD and Windows

2000,

have boot managers of their own, and can therefore be

installed either before or after 7 is installed with little addi-

tional fuss. However, those operating systems without their

own boot managers, such as Windows 9x/Me, will break the

Windows 7 boot manager if installed subsequently. For an-

other consideration, see the sidebar “Of Operating Systems

and Filesystems” on page 29.

Modify the Boot Manager configuration

The Windows Boot Manager is responsible for loading Windows 7, and, op-

tionally, booting any other operating systems you may have installed.

The Boot Manager in both Windows XP and 2000 stored its configuration in

a tiny, easily editable file called boot.ini in the root folder of your C: drive, but

in Windows 7, this file is no longer used. If you install 7 on an XP system, and

then open the boot.ini file left behind, you’ll see this message:

;Warning: Boot.ini is used on Windows XP and earlier operating systems.

;Warning: Use BCDEDIT.exe to modify Windows 7 boot options.

The BCDEdit (bcdedit.exe) tool that comes with Windows 7 is a command-

line tool, and isn’t exactly user-friendly. Open a Command Prompt window

Install Windows 7 | 27

Get Started with

Windows 7

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