Changing the System/Boot Drive Letter
Make a full system backup of the computer and system
state.
Log on as an Administrator.
Start Regedt32.exe.
Go to the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
Click MountedDevices.
On the Security menu, click Permissions.
Check to make sure Administrators have full control.
Change this back when you are finished with these steps.
Quit Regedt32.exe, and then start Regedit.exe.
Go to the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
Find the drive letter you want to change to (new). Look
for "\DosDevices\C:".
Right-click \DosDevices\C:, and then click Rename.
NOTE: You must use Regedit instead of Regedt32 to rename
this registry key.
Rename it to an unused drive letter "\DosDevices\Z:".
(This will free up drive letter C: to be used later.)
Find the drive letter you want changed. Look
for "\DosDevices\D:".
Right-click \DosDevices\D:, and then click Rename.
Rename it to the appropriate (new) drive
letter "\DosDevices\C:".
Click the value for \DosDevices\Z:, click Rename, and
then name it back to "\DosDevices\D:".
Quit Regedit, and then start Regedt32.
Change the permissions back to the previous setting for
Administrators (this should probably be Read Only).
Restart the computer.
