Here is my file , see if it helps .
Download Tweakui , complete with install instructions from ,
http://www.microsoft.com/ntworkstation/downloads/PowerToys/Networking/NTTweakUI.asp
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Go into the device manager to the drive(s) you want to change the letters of and select properties. Then on the settings tab you will see "Reserved Drive letter". Change that to read the letter you want, in both 'start, and end' drive letter assignment.
Reboot---------------------------------------
Letter Assigner . ( Freeware )
http://www.v72735.f2s.com/LetAssig/Screenshots.html
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How to Prevent Drive Letters from Changing After You Add a Hard Disk or a CD-ROM (Q282530)
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q282530
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COA32 (Change of Address/32) is a 32-bit Windows version , which
runs under Windows 95/8 and Windows NT 3.51 or higher, lets you change
the drive or directory of a Windows program without having to
reinstall the program.
It works by searching for all references to the old path and updating
them to reflect the new path.
http://www.zdnet.com/downloads/stories/info/0,10615,77440,00.html
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Another way through the registry .
Start / Run , type in regedit , press OK or Enter , press F3 , tick
1st 3 boxes , type in LastDrive , press Enter . Make lastdrive=Z
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Try , Control Panel > System > Device Manager > Disk drives , double click on the 1st drive & click on Settings . Tick Removable , this now allows you to change your drive in Current drive letter assingnment .
Repeat for the other drives .