Acer Aspire axc-603g windows 7 downgrade problem

So I have been tasked to set up a computer for relatives on a brand new Acer Aspire axc-603g desktop computer. One of the things is downgrading from windows 8.1 to windows 7. I have a windows 7 install disc and have tried booting from the disc to install from there. It gets from the "loading files" bar to the "starting windows" when a blue screen pops up saying
"Error: 0x000000A5 Bios is not fully ACPI compliant". This stops any kind of installation to happen.

Things to note:
1) I have disabled secured boot
2) Bios has been set to the legacy setting.

I have reason to believe this error has something to do with UEFI but I am not certain. Any help would be amazing!!