You really need the boot floppy. Try a different floppy. If it doesn't work the first time, try again and again. I heard rawrite can be moody. If you have access to a linux machine, write the floppy using the dd command. If you have access to a (classic) mac os machine, write the image using Disk Copy. Or see if you can find any other image writing programs for windows and try those. Make sure you select the right floppy image. I believe there are several on the cd-rom.