didn't see this issue anywhere--hd letters jumbled

I have xp, sp2.
I installed a second internal hd and then used "Aconis" software to clone my original HD to it.
Everything worked and is working fine--except--my original D drive has E: assigned to it and the clone of original C has D: assigned and clone of D has E: assigned--
I'd like to change the lettres for easier identification but when I use disk management to change drive letters the ones I want to use don't show up.
Any ideas?

Thanks

 

figured it out--changed letters of clone to O & P and rebooted, then was able to select D: for what was labled E: