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The Windows 8 developer preview is out for all to try, but installing it over your main Windows setup is a scary (and unrealistic) prospect. Here’s how to dual boot Windows 8 with your current Windows 7 installation so you can run them both side by side. If you’ve ever dual booted a machine before, this shouldn’t seem too foreign. All you need to do is create a new partition for Windows 8, install it on that partition, and then edit your new boot menu so Windows 7 stays the default OS. Here’s how to do it.


Before you start, make a backup of your data—you’re going to be formatting drives and installing OSes, so anything could go wrong, and you don’t want to lose your whole system. When you’re ready, we’ll need to create some space for Windows 8 on your hard drive. Assuming you have at least 20GB of space free on your drive, you’re going to use Windows’ Disk Management to set partition those 20GB for Windows 8. Open the Start Menu and right click on the “Computer” option. Click “Manage”, and in the window that appears, click on “Disk Management” in the left sidebar. Find your system hard disk in the graphical list that appears in the bottom pane. Right-click on it and then click “Shrink Volume”. Shrink it down so you have at least 20GB of space left on the end of the drive, and click OK. Then, click on the “Unallocated” block of that drive that appears and click “New Simple Volume”. Click Next on the next few windows until you get to the “Format Partition” window. Here, give it a volume label you’ll recognize (like “Windows 8″) and click Next. It should format the drive for you. Now you’re all set to install Windows 8.
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