My disk automatically converts to gpt

Probably you are booting in UEFI mode. You will need to boot in legacy mode (CSM mode enabled) to install windows on a MBR partition.

 

Format doesn't change partition style. You must convert GPT to MBR or vice versa.

 

zero out the drive using your favorite low level formatting program, it will remove any partitions that might be missed

 

Rufus isn't a disk partitioning tool. Try using Gparted to initialize the disk as ms-dos (MBR).

 

Guess cuz you´re disk is larger then 2TB.

 

If you are installing using a usb thumb drive, make sure that you are using a usb2.0 port on your computer. Also, you can't install windows 7 on a NVMe SSD unless UEFI is enabled (I don't know if that's the case?)

 

Are you sure about that ?

 

Yes. UEFI is a requirement if you want to boot from a NVMe drive. You can install a NVMe drive on a legacy system but it won't be bootable.
You can try to emulate an UEFI environment using DUET and REFIND at your own risk if your system doesn't have uefi or nvme boot support (google "NVMe-boot for systems with legacy BIOS").

 

My hint: 1. use x64 win7 2. Remove the bootmgr file by deleting from the root of you´re win 7 iso then create you´re USB/DVD install.

 

i suppose this does not concern windows8.1/10 as both of theses OS support usb 3.0 drivers.

 

all this to activate?
flash slic 2.1 bios
use slmgr.vbs to install certificate (you can get certs in here)
use slmgr to install generic oem key of slic (u can get the keys.ini from loader 2.2.2 folder)

enjoy GPT efi without fking up your partitions.