The computer you want to install it doesn't have an OS? Well if that machine has a network card that RIS service supports you can make a bootable floppy and it should take care of everything.
First you'll need to install the RIS service on advance server, go to control panel add remove programs and windows components. then check remote installation services.
For this service to work you'll need a 2gig partition that can't be the system or boot partition, and it must be ntfs. You'll need to authorize the RIS server, this is done with the dhcp interface.
Once you have everything setup, in run just type risetup and a wizard should guide you through it. It'll help you setup an image once you're done, you run rgbf.exe to create the bootable floppy disk. Remember RIS only supports like 25 network cards so if it doesnt' support your nic then you wont be able to use this service.
Thats all i know about the service, I haven't actually used it myself, so good luck.
