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In order to run a 64-bit operating system in a window, the host

PC must also be running a 64-bit operating system. And 64-

bit Windows requires a 64-bit processor, as described in“64-

Bit Windows” on page 6. At the time of this writing, running

a 64-bit guest OS is only supported in VMware and Virtual-

Box.

Setting up a new virtual machine is a snap. Here are a few sample scenarios:

Run a virtualized Windows 7 in Vista

Want to test Windows 7 in a virtual environment on your Vista PC before you

commit? Here’s how.

Start by installing Microsoft Virtual PC 6.0 on your Vista PC, and then start

Virtual PC. On the Virtual PC Console window, click New and then follow

the prompts in the New Virtual Machine Wizard.

When it asks you to choose an operating system, select Windows Vista and

click Next.

Next it’ll ask you to allocate memory; this is the amount of physical RAM the

guest OS sees, so give it enough to run (at least 1.0–1.5 GB). Whatever you

allocate for the virtual machine will be sucked out of your host PC’s memory,

so don’t give it more than you can spare. Click Adjusting the RAM and move

the slider or type a value (1536 MB for 1.5 GB) and then click Next.

Next comes the virtual hard disk, the .vhd file your virtual machine uses for

storage. Select the A new virtual hard disk option, click Next, and then

specify a filename (and folder). Thankfully, the virtual hard disk works differ-

ently than the RAM: the file starts off small and grows as needed. The value

you specify for Virtual hard disk size is only a cap, so type a sufficiently large

number (like 100000 for 100 GB) and then click Next. Click Finish to close

the wizard.

You can change the virtual hardware assigned to your new

virtual PC at any time—unless the virtual machine is running

or paused—by clicking the Settings button in the Virtual PC

Console.

32 | Chapter 1: Get Started with Windows 7

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