Windows 8 and 8.1 Forums

If I have 8.1, how do I add 7 as dual boot?

  1. #1

    Posts : 36
    Dual boot - Win 7 Pro 64-bit and Win 8.1 Pro 64-bit

    If I have 8.1, how do I add 7 as dual boot - or reverse?

    I may be in the wrong place - my wife says I'm ALWAYS in the wrong place - but at least I ask for directions.

    1) Where is there another great thread that tells me how to add Win 7 Pro 64-bit as a dual boot if I am starting with Win 8 (or 8.1) Pro 64-bit already installed? (Maybe it's here, but on which of these 36 pages?)

    2) Can I do that by adding a second hard drive instead of partitioning my existing Win 8 (or 8.1) hard drive?

    3) In sevenforums, a great (and also very long) thread says I should NOT turn off UEFI or I'll brick the machine. So I'm already scared. Is that right? (See UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Help Forums )

    4) If my Win 7 Pro 64-bit install disk is a Dell OEM Reinstall disk for my PC (a Dell Optiplex 7010 MT), will this work? I don't have a separate MS retail product key for the Win 7 install.

    5) Is this just too hard and I should do something else with my life?

    Last edited by glnz; 25 Oct 2014 at 08:08.

      My System SpecsSystem Spec

  2. #2

    I would not make the machine a dual boot machine by going backwards. Normally, the rule of thumb is for a dual boot machine, you have the oldest OS installed first, then the new one, and the new one after that. IE, windows XP, Vista, Windows 7, and then Windows 8.

    However, a very good solution for you is to create a "Virtual Machine" for your Windows 7. Then you can run your current Windows 8 and Windows 7 side by side so to speak. To do this, you must download and install VM Player and or Virtual Box (Both free). Once you have either one of these installed, start the Virtual software, and then create a new one and put in your Windows 7 DVD and away you go.

    I'm pretty sure there are more tutorials on this site explaining this in more is fairly simple. Once you have Windows 7 installed in a virtual machine, you could then download the Windows 10 Preview and run it in a VM as well. Loads of fun. Enjoy!
      My System SpecsSystem Spec

  3. #3

    Posts : 36
    Dual boot - Win 7 Pro 64-bit and Win 8.1 Pro 64-bit

    play2 - Thanks for post and suggestion. Let's take your advice.

    Suppose I install Win 7 Pro SP1 64-bit in the machine as the ONLY operating system - erasing Win 8 (8.1) entirely. However, my machine also came with a Dell OEM Win 8 Pro 64-bit install (or reinstall) disk. So --

    1) Can I use the Dell OEM Win 8 Pro 64-bit install (or reinstall) disk to create the new dual-boot with Win 8/8.1?
    I don't think I'll have a separate product key. I think my Win 7 install will "use" the only product key.

    2) Must I put the new Win 8/8.1 on a new partition on my only hard drive? Could I instead put a second hard drive in the machine and install Win 8/8.1 there?

    3) Going back to the initial install of Win 7 only, in sevenforums, a great (and also very long) thread says I should NOT turn off UEFI when I install Win 7 or I'll brick the machine. Is that right? (See UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Help Forums )

    Thanks. These questions are closer to the original topic here anyway.
      My System SpecsSystem Spec

  4. #4

    You mentioned using another HDD to install Win7 on it. That's what I did and with several drives containing different OSs. To make sure nothing is mixed up, I disconnected all other drives while doing it. After connecting back other drives I'm left with options to choose boot device thru BIOS (safest way) or use EasyBCD on each windows to make a boot menu and choose from that.
      My System SpecsSystem Spec

If I have 8.1, how do I add 7 as dual boot?

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