I did this a few times with win9x not NT, load windows in a different machine right up to the windows detecting hardware bit. switch off machine transfer Hard disk to new machine and windows chuggs away completing its instalation on new machine.
Seems a silly thing to do , but I had no floppy and the other machine didn't have the option of booting from the windows cd rom.
PS the only experience I had with NT was it totaled a brand new 20 gig IBM deskstar, had to return same to IBM.
Have no complaints about win2k its been running my dual system steady as a rock.