With previous stages of the release (Developer Preview, Consumer Preview), it was recommended to use dual boot to maintain your current Windows installation.With the Release Preview, the OS is far closer to final, so upgrading using the Windows 8 Setup Program is the recommended path.
If you still want to maintain your existing Windows installation, you can dual boot Windows 7 with Windows 8 Release Preview by following these steps:
You will need to install Windows 8 Release Preview to a partition that is at least 20 GB and is separate from your existing operating system. If you need to create a separate partition on your hard drive, do the following:
A. On the Start screen, type Computer, right-click Computer, click
Advanced, click Manage, and then click Disk Management.
B. Find your system hard drive in the bottom pane.
C. Right-click your system drive and then click Shrink Volume. Shrink it until you have at least 20 GB of space left on the end of the drive. (If you already have 20 GB of unallocated space, you can skip to the next step.)
D. Click the “Unallocated” block on that drive and click New Simple Volume.
E. Follow the wizard through the next few screens, such as assigning it a drive letter. For the
Volume label, choose a label you’ll recognize like “Windows 8 Release Preview”.
Step 3: Install Windows 8 Release Preview
When you use the Release Preview Setup program, there will be an option after the download completes to
Install to another partition. Selecting this option allows you to create installation media that is customized for your machine based on your current architecture and language, and also gives you a unique product key that you will need to enter when
you start Advanced Setup later.
Once you have created the installation media from either source, just start your PC to your Windows 8 Release Preview installation media, choose your language, click
Install Now, and choose Custom when asked which type of install you’d like to perform. You will need to enter your product key when prompted.
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