ms os support

Win2K and above support USB out of the box.
I believe that there was an add-on you could install for NT4 to support USB v1.

Windows 95 "C" (2.5) has limited USB support if you install the USB supplement on the CD.

Windows 98, 2000, Me, XP and later all have native USB support.

Joseph Moore is correct that a 3rd party add-on provides LIMITED USB support for NT.

Chas