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Dual Boot Windows 7 with preinstalled Windows 8 on GPT-formatted hard disk and UEFI BIOS.

Answered Dual Boot Windows 7 with preinstalled Windows 8 on GPT-formatted hard disk and UEFI BIOS.

  • Thursday, February 21, 2013 8:39 PM
     
     
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    Question for Jordon Wees,

    Hi,

    You wrote: I can successfully install both operating
    systems in UEFI mode, with Windows 7 on the first partition and Windows 8 on
    the second partition. <o:p></o:p>

    But I couldn´t!<o:p></o:p>

    Could you please provide me how to install Windows 7
    64 bit on a PC that already has Windows 8 64 bit preinstalled?<o:p></o:p>

    I have also a GPT-formatted hard disk with UEFI BIOS
    but I get the error message that windows can´t install Windows 7 on the disk
    because it is a GPT-formatted hard disk.<o:p></o:p>

    I don´t understand this because it is a GPT-formatted
    hard disk with Windows 8 on it!<o:p></o:p>

    I can´t change the hard disk to MBR format because I
    will lose Widows 8 and all other partitions.<o:p></o:p>

    In the BIOS for the storage dives Boot´ option I
    selected the: only UEFI, I could also select the option ´first UEFI´ but it doesn´t
    change the failure of installing Windows 7.<o:p></o:p>

    Thanks, Sia

     

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