How to install Windows 8 while there is Windows 7 already?

Sidharth Verma June 20, 2013
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I want to install Windows 8 on my PC, which already has Windows 7 . When I start the setup, Windows 8 asks for 20 GB of space on C drive, but my old Windows already has consumed that amount of space. So how to uninstall Windows 7 and install Windows 8?

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  1. Tsf O
    August 28, 2013 at 6:28 pm

    Once you install windows 8 on a system it will not allow you to install a prior OS like windows 7, this is because of the way the file system is layed down on the HD.
    Windows 7 uses a NTFS file structure where as Windows 8 Uses a GPT file structure.
    The data is layed down and located on different parts of the drive. That is why windows 7 cannot install due to the Gpt format of the drive. As it is an older operating system and does not understand GPT format.
    so make sure you install windows 7 and then win8.

    • Bruce E
      September 8, 2013 at 9:51 pm

      Windows operating systems won't allow you to install an older version after a newer version is already on the machine but it has nothing to do with any existing filesystem. This is just something that Microsoft engineered into their OS installers to prevent potential conflicts that can arise due to the differences in the operating systems. It was more of an issue prior to XP than after, but Microsoft has kept the restriction (possibly to simply discourage users from installing older operating systems on new computers with the latest MS OS). Both Windows 7 and Windows 8 use the same NTFS file system. The GPT you are referring to is not a file system, but a partition table structure designed to handle larger hard disks more efficiently. It is also supported in Windows 7 and Vista.

  2. Amit
    June 25, 2013 at 12:45 pm

    The best option is to use VMware software.

  3. Peter
    June 23, 2013 at 2:32 pm

    You can also use a virtual machine. I have Windows 8 on VMware.

    Without a touchscreen Window 8 is like a strip club- look but don't touch.

  4. Jon Green
    June 21, 2013 at 11:21 am

    To be honest, if you're that tight on disk space, I'd not recommend trying to load Windows 8 at all.

    Let's assume you manage to squash and squeeze your existing data down far enough (type "Free up disk space" into the Start button's search box for a good starting point) to do the upgrade. Now think about how much - or rather, how little - you'll have left to actually use once the upgrade's complete. It won't be a usable PC.

    Rather than try to stuff a quart into a pint pot, maybe the better solution would be a hard disk upgrade first? Use a disk ghosting package to copy your existing system onto the new disk before switching them over. Once you're happy with the results, and it's all working, then do the upgrade. Believe me, you'll be glad you took that route - and you'll have a PC you'll be able to use!

  5. MdMontaser
    June 20, 2013 at 5:05 pm

    Its better you first format ur windows 7 then install windows 8 :)

  6. Oron Joffe
    June 20, 2013 at 2:19 pm

    You don't say whether your Windows 8 is a full installation or the upgrade disc. If the former, you can format your hard disc and install the new system, but obviously you shouldn't do this if it's an upgrade...

  7. ha14
    June 20, 2013 at 1:15 pm

    you can use partition manager to increase the space of windows 7 thus getting more like 30GB enough to install windows 8 as upgrade from windows 7.
    the wizard windows 8 should ask Choose What To Keep

    How To Shrink & Extend Volumes Or Partitions in Windows 7
    http://www.makeuseof.com/tag/shrink-extend-volumes-partitions-windows-7/

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