Samsung PRO 950 SSD recognized as SATA instead of PCIe inWindows 10

I have a new ASUS G752VL-DH71 laptop and I installed a SAMSUNG 950 PRO M.2 512GB PCI-Express 3.0 x4 SSD in it. The hard drive is totally usable in Windows (as drive G:) but there are three issues:

1. The write performance of the drive according to Anvil Utilities is only 54 MB/s, which is much lower than it should be.
2. I tried to install the official Samsung NVMe Driver v1.1 from this page but the installer gives me the error message "Samsung NVM Express Device is not coected. Coect the device and try again."
3. The drive is not recognized by my Windows 10 USB installation media, which is a problem because I want to eventually install Windows 10 on the SSD.

I think the root problem that is causing all of these issues might be that there is some virtualization/compatibility layer/driver ruing that is taking the drive and making it look like a SATA drive instead of a PCIE drive. The Device Manager shows that my SSD is being controlled by the Intel Chip SATA Raid Controller (iastora.sys):

I looked around in the BIOS of this laptop, which is version 208, and tried changing various options but that did not help.

How can I make Windows recognize my SSD as an NVMe device instead of a SATA device?