The guy moved his D: drive (CD-Rom) to K: so now he wants all of the others to be changed back a letter to fill in the empty D: spot.
My suggestion is if your last partition doesn't have any applications installed on it that have registry settings, just change that drive to D: and change your CD drive to J: if you want.
You don't have to change them all. The drive letter has nothing at all to do with where on the hard drive that partition physically exists. They are just letters that Windows uses to access that partition.
Honestly, why does it matter that the CD drive is D:? And why do you need that many Windows partitions?