In short, NT 4.0 only supported install to a mealy (by today's standards) 4 or 8GB partition and only then if it was under some cylindar limit.

To install NT 4.0 will stress anyone but one person I know since it's very archaic and has limits. Installing drivers on NT 4.0 may drive many to bash their PC into little bits.

It's apparent you need to read more about this old OS.

In short, no partitions, boot the NT CD and use its tools to install.