Well then, you may have other issues besides your hard drive. If you have a genuine Windows CD, not a pirated version which may not work right, and you did, indeed, create floppy disks which should be bootable, then there's something wrong with your computer. This is assuming your CD drive and you floppy drive are not defective.
What, exactly, happens if you've set CD-ROM as the first boot device and you have the Windows CD in the CD drive and then restart your computer?
Exactly what make and model is your computer and/or your motherboard? Why did you decide to replace the hard drive? Were you experiencing certain problems before that decision?