Unable to make dual boot Windows 7 and Windows 8 x64

Discussion in 'Windows 8' started by reniew, Oct 30, 2012.

  1. reniew

    reniew MDL Novice

    Aug 13, 2009
    I bought a netbook Asus 1225B with preinstalled Asus Express Gate without Microsoft OS.
    I installed Windows 7 Professional x64, removing all partition made by manufacturer.
    An instalation and activation with moded BIOS, cert and SLP worked perfectly.
    Finally I got two partitions: C, with OS and D - mede by me for recovery or any future purpose. Bot are NTFS.

    I downloaded Windows 8 (upgrade offer) and made instalation disc on my Kingston 16 GB pendrive, the same I used to install windows 7.
    When I try to install on D partition I got a message:
    "Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks". Also I cannot install on C - the message is the same.

    When I removed both partition and a space reserved for the system (100MB) I could do a clean install of Windows 8 without any problems, but I could not install if the Windows 7 is installed on C:
    Is it possible to make dual boot on my netbook?
    Is EFI responsible for it?
    Any idea how to resolve this problem?