Change Drive Letters

This is with reference to my previous post :

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Is it possible to change my disk drive letters allocated
by windows xp pro. I had added a new HDD after installing
xp pro and now its named f: i want to change it to d: .
Currently it is as follows
a: FDD
c: HDD containing XP files (NTFS)
d: CD RW Drive
e: CD ROM Drive
f: NEW HDD Empty And formatted using NTFS

What I want It To Be

a: FDD
c: HDD containing XP files (NTFS)
d: NEW HDD Empty And formatted using NTFS
e: CD RW Drive
f: CD ROM Drive
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As I said my CD Writer has already occupied the D: and
now all I can change my HDD drive letter to is any letter
after F: whereas I want to change it to D: and therefore
shift current D: and E: appropriately. (Where D and E are
my cd rw/rom drives and C: is my system drive). Someone
pls tell me how should I change the drive letter of my cd
rw/rom drives first and then keep the d: free for my HDD.