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Installing on a desktop PC and suspect your video adapter is

sabotaging your installation? If your motherboard has built-

in video that you’re currently not using because of an add-on

card, just re-enable the on-board video through the system

BIOS (if necessary), and then remove the troublesome card.

Or if the on-board video is to blame, try assigning it more video

memory (again, see Appendix A) or replacing it with an add-

on video card.

Next, if you see an error that says something like “failed to open the Windows

image file,” this is an indictment of your DVD drive. Setup installs Windows

7 from a single, huge hard-disk image file, and some older drives can’t handle

files larger than 3 gigabytes in size. The solution is to replace the drive, or, if

you’re particularly attached to the drive and you’re not in a hurry, purchase a

copy of Windows setup on a stack of CDs (which Microsoft calls “alternate

media”) and try again.

Lastly, if it’s an older disc, the culprit might be nothing more than a little dust;

wipe the disk against your shirt and try again.

Set Up a Dual-Boot System

Dual-boot

(or multiboot) installations used to be all the rage, and even though

virtualization (discussed in the next section) has stolen a lot of their thunder,

there are still times when having two or more operating systems installed side

by side on the same PC can be useful.

For instance, you can have both Windows 7 and Windows XP—or Windows

7 and Linux, for that matter—installed on the same PC, and choose which to

boot each time you power on the machine. Now, virtualization does this one

better by allowing you to run both platforms simultaneously, but it has its

limitations. Most notably, a virtualized Windows won’t run nearly as fast as

a non-virtualized installation; if speed matters for every OS you use, a dual-

boot setup is the way to go.

Also, virtualized operating systems don’t have full access to your PC’s

hardware—particularly non-USB devices—while each OS on a multiboot sys-

tem can use everything for which drivers are available. Games are a great ex-

ample; without unfettered communication with your 3D video hardware,

many games won’t run, and that rules out virtualization.

Windows 7 comes with built-in support for a multiboot setup called the Win-

dows Boot Manager, which is installed automatically whether you want a dual-

boot system or not. If, at the end of the installation, Windows 7 is the only

operating system on your computer, it boots automatically without giving you

26 | Chapter 1: Get Started with Windows 7

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