You are facing a long standing Windows installer issue (Erro na instalação do SO Dual Boot)
In your Computer’s BIOS, it’s currently configured to support the following two Boot modes:
- UEFI
- Legacy
Your computer actually boots a Legacy installed Windows installation (no EFI Partition with a Bootloader, but a MBR instead). The installer assumes you have booted a UEFI installed Windows, as your computer supports it as stated by the BIOS configuration.
So, essentially, you need to enter your BIOS and set your Boot Mode to “Legacy only” to fully disable UEFI booting capabilities. Now the installer will work as expected.