First things first...Is this an older laptop?
can it boot a USB drive?
To do what you want to do is going to create issues...first the active partition (DOS) will read as C:\ and the windows partition in setup will read as D:\
so your main windows partition will always be D:\
if your C:\ drive is FAT32 you can copy the I386 folder and run C:\I386\Winnt.exe from the command propt and load windows that way...
a better way is to make a bootable DOS partition that you can boot a network drive to... but that is a pain too
your best bet is to purchase a USB CDrom drive and run the install from there
the way I would do it is to pull the drive fron the laptop and using and laptop to IDE adapter for a desktop
wipe the drive
format as FAT32
load the I368 folder
follow the directions on linney's links
create a bootable floppy
copy the system files on the bootable floppy to the laptop drive to make it bootable
put the drive back into the laptop
it should boot to
C:\ in DOS
CD I386 it should read C:\I386\
winnt.exe
That is the simple version and not the best way to install windows