Your fault - you posted your help request into a Win7 thread. Look at the thread title! So you posted into a wrong/not matching thread. After having solved your problem I will move this discussion into a separate thread.
To be able to boot off an NVMe SSD (only exception: Samsung 950 Pro) you should
- a) enter the BIOS and choose the settings, which are required for an OS installation in UEFI mode (CSM should preferentially be set to “Disabled”, the “Fast Boot” and “Secure Boot” options should be disabled as well) and
- b) install the OS in UEFI mode using the GUIMode Partition Table (GPT).
For more details please look into the chapter “4. Installation of the OS onto the NVMe SSD:”, which can be found within the start post of >this< thread.