Make sure you have a bootable (start-up) floppy. Use FDISK to delete all existing partitions and then set up your entire HD as a single partition.
NB You may have problems with larger partitions if using SE - I think the max is 8GB, so you might want to reconsider your partition plan.
Once complete, close FDISK and format each partition you have created. Now re-boot using your setup floppy. This will allow you to install a CD driver and will report back to you the drive letter of your CD drive. This is important to remember.
Now insert your Windows install CD, and, at the a: prompt type
<your CD drive letter>\Setup and follwo the on-screen prompts.