Win 8.1 to 7 downgrade bios not fully acpi compliant

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  1. Posts : 6,458
    x64 (6.3.9600) Win8.1 Pro & soon dual boot x64 (6.1.7601) Win7_SP1 HomePrem

    jamesb1996 said:
    ..... Have been told to install with a dvd but havn't tried this yet. .....
    Win7 UEFI install media on USB must be formatted FAT32

    Have you tried the DVD yet? There isn't a file system issue with DVD install media.
      My Computer

  2. Posts : 3
    Windows 7 x64 ultimate

    looks like this was never solved precisely. I Am having the same issue and do have install cds. In fact I have win 7 x64 and 32 OEM version with valid keys. I also have an OEM windows 8 cd. The win 8 will load on my dell inspiron 15-3531. But after a HDD issue I wanted win 7 and the NON acpi error pops up. I would load secure boot and win 8 which works and just go through the online update process to win 10 but the bios key in the inspiron is for win 8.1 so the win 8 OEM i have will not validate. I AM STUCK.
      My Computer

  3. Posts : 3
    Windows 7 x64 ultimate

    Will not get into windows setup
      My Computer

  4. Posts : 3
    Windows 7 x64 ultimate

    I've also followed the process to set the bios but no dice. It's the InsydeH20 bios. Secure Boot - Disabled. Load Legacy Option Rom - Enabled. Boot list option - Legacy. Still no luck same ACPI error trying to load any version of Win 7
      My Computer

  5. Posts : 1
    Windows 7 64Bit

    The real ACPI fix!

    I would suggest downgrading the Bios to an earlier version that doesn' throw the ACPI error. Newer Bios's don't support Windows 7.
    Last edited by Barman58; 05 Jun 2017 at 13:32.
      My Computer

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