How to Dual Boot Windows 8 and Windows 7


Want to try Microsoft’s next operating system, Windows 8, without losing your Windows 7 system? Installing Windows 8 in dual-boot mode is a snap with our guide.


Want to test the wild new waters of Windows 8 but don’t want to lose your current Windows setup? You can do this with the Windows 8 installer, which can create a multi-boot setup. I’ve been running one of my test PCs at PCMag this way for several months, and the clear new-style (we can’t use the term Metro anymore) multi-boot menu dutifully appears whenever I restart the system. Setting up such a system isn’t hard at all, as long as you prepare for this kind of installation.
One note to bear in mind: The multi-boot setup only works with Windows 7 and Vista: You can’t set up a multi-boot system with Windows XP, let alone Ubuntu.

Before you attempt this, however, you should back up your existing Windows PC. You never know what will happen when installing a new Operating System. As a minimum you should back up all your photos, videos, and documents. There are many great utilities designed to backup the contents of your computer but we recommend MYSecureOnlineBackup, powered by Mozy, the world leader in online secure backup. Register today and take advantage of our incredible 3 month trial offer at less than 1 Pound per month!


You’ll have to create a partition of at least 16GB (20GB for 64-bit Windows 8) for your side-by-side Windows 8 installation, we recommend a partition size of 50GB.. To do this, type “disk management” in the Start button’s text box, which will display a “Create and format hard disk partitions” choice at the top of the Start panel. Click on that to open the Disk Management utility. You’ll probably have two partitions. Right-click on the largest one, and choose Shrink Volume from the context menu.


A “Querying Shrink Space” dialog will appear for a while, then another message will tell you how much free space can be squeezed out of the drive in MB. Enter a size above 16GB for the 32-bit version of Windows 8 and over 20GB for the 64-bit flavour, and then hit the Shrink button. This will create an unallocated section equal to the size you chose in the chart at the bottom of the window. Leave it be for now, we’ll let the Windows 8 installer take over from here.

Now it’s time to actually get your copy of Windows 8, which at this point means making a purchase (if you haven’t already). You can purchase and download this from Microsoft’s Web Shop. You have a choice between 32-bit and 64-bit; since most modern PCs are 64-bit capable, that’s a better choice. Use Windows 7’s included disc image burning utility to create an installer DVD from the ISO file once you’ve downloaded it, or you can create a bootable USB key using the Windows 7 USB/DVD Download tool. You must boot to the upgrade disk or USB drive: You can’t create a dual-boot system by starting the installer within Windows while it’s running.

Pop in the installer DVD you burned or the USB stick you prepared, and restart your PC. Choose your language, then “Install Now.” You will have received a product key when you made your purchase, you will need this key at the next stage. Accept the software license, and after this, choose Custom and not Upgrade. Now is when you will be presented with the choice of partitions, click “Drive options (advanced)” and then select the Unallocated space we created in step 2. Next, click New from the drive options icons below. Accept the full size displayed, and hit Apply.


Now we’ve got a fresh partition to on which to install Windows 8 onto. Hit Next, and setup is off and running. Go have a coffee or a snack of your choice; it takes about 20 minutes. Note there was no choice for specifically creating a multi-boot setup—since you used a separate partition that will be enabled automatically.
Your system will reboot into Windows 8, where you’ll go through the typical first-run options of choosing a color pattern, WiFi connection, and Microsoft account. The next time you restart your system, however, you’ll see this Windows 8 multi-boot menu before the OS starts:


By default, this screen displays for 30 seconds, and then Windows 8 launches. To change that default to your older OS, choose “Change defaults or other options” from the bottom of this multi-boot screen. Here you can change the timer value and the default boot operating system. You can also use troubleshooting tools like Refreshing or Resetting your PC, and you also have access to advanced options like system recovery and a command prompt.
And that’s about all there is to say about multi-booting with Windows 8. For more on getting, installing, and running Windows 8, contact our experienced support department, and ask them about installing and dual booting Windows 7 and 8.

4 thoughts on “How to Dual Boot Windows 8 and Windows 7

  1. In Step 3, if I have actual bought media, rather than a downloaded ISO file, how do I install?

  2. If you have purchased media in the form of a retail DVD you can omit step 3 entirely, step 3 only refers to obtaining the Windows 8 installer as an ISO and creating the physical media.
    If you need further help please let us know, we are happy to help.

  3. Thanks for the earlier answer. When I purchase media, do I need Win 8 Pro rather than Win 8 Core as I have heard that there may be problems in dual booting with the basic edition? Also, do I need to have the full version or will the Upgrade version work?

  4. You should really use a full version of the software as it is not permitted to use upgrades since you will effectively be invalidating your current installation by upgrading. The only way around this is to have two valid licenses, where you will upgrade one of them and use the other as the dual boot operating system.
    You can dual boot any full version of Windows 8 since you will have two completely separate installations – if it will install “stand alone” you can dual boot.
    Just a note; dual booting requires a cold boot (booting from shut down, NOT just logging out)
    Hope this helps.

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