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Windows 7: Win 8.1 to 7 downgrade bios not fully acpi compliant

09 Jul 2014   #11

x64 (6.3.9600) Win8.1 Pro & soon dual boot x64 (6.1.7601) Win7_SP1 HomePrem

Quote   Quote: Originally Posted by jamesb1996 View Post
..... 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 System SpecsSystem Spec
21 Jan 2016   #12

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 System SpecsSystem Spec
21 Jan 2016   #13

Windows 7 x64 ultimate

Will not get into windows setup
My System SpecsSystem Spec

21 Jan 2016   #14

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 System SpecsSystem Spec
05 Jun 2017   #15
Dave Nyemaster

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.
My System SpecsSystem Spec

 Win 8.1 to 7 downgrade bios not fully acpi compliant

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