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Message: <blockquote data-quote="Sachchaka" data-source="post: 10525163" data-attributes="member: 149450">How to restore the system/boot drive letter in Windows<a href="http://support.microsoft.com/?kbid=223188" target="_blank">http://support.microsoft.com/?kbid=223188</a>How to restore the system/boot drive letter in WindowsWarning Do not use the procedure that is described in this  article to change a drive on a computer where the drive letter has not  changed. If you do so, you may not be able to start your operating  system. Follow the  procedure that is described in this article only to  recover from a drive letter change, not to change an existing computer  drive to something else. Back up your registry keys before you make this  change. For more information, click the following article number to view the article in the Microsoft Knowledge Base:  <a href="http://support.microsoft.com/kb/249321" target="_blank">249321</a>                                 Unable to log on if the boot partition drive letter has changed   This article describes how to change the system or boot drive letter in  Windows. For the most part, this is not recommended, especially if the  drive letter is the same as when Windows was installed. The only time  that you may want to do this is when the drive letters get changed  without any user intervention. This may happen when you break a mirror  volume or there is a drive configuration change. This should be a rare  occurrence and you should change the drive letters back to match the  initial installation.To change or swap drive letters on volumes  that cannot otherwise be changed using the Disk Management snap-in, use  the following steps.Note In these steps, drive D refers  to the (wrong) drive letter assigned to a volume, and drive C refers to  the (new) drive letter you want to change to, or to assign to the  volume.This procedure swaps drive letters for drives C and D. If you do not  need to swap drive letters, simply name the \DosDevice\letter: value to  any new drive letter not in use. <a href="http://support.microsoft.com/?kbid=223188#top" target="_blank"><img src="http://support.microsoft.com/library/images/support/kbgraphics/public/en-us/uparrow.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />Back to the top</a>Change the System/Boot Drive LetterImportant  This section, method, or task contains steps that tell you how to  modify the registry. However, serious problems might occur if you modify  the registry incorrectly. Therefore, make sure that you follow these  steps carefully. For added protection, back up the registry before you  modify it. Then, you can restore the registry if a problem occurs. For  more information about how to back up and restore the registry, click  the following article number to view the article in the Microsoft  Knowledge Base: <a href="http://support.microsoft.com/kb/322756" target="_blank">322756</a>                               How to back up and restore the registry in Windows<ol> <li data-xf-list-type="ol">Make a full system backup of the computer and system state.</li> <li data-xf-list-type="ol">Log on as an Administrator.</li> <li data-xf-list-type="ol">Start Regedt32.exe.</li> <li data-xf-list-type="ol">Go to the following registry key:HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices</li> <li data-xf-list-type="ol">Click MountedDevices.</li> <li data-xf-list-type="ol">On the Security menu, click Permissions.</li> <li data-xf-list-type="ol">Verify that Administrators have full control. Change this back when you are finished with these steps.</li> <li data-xf-list-type="ol">Quit Regedt32.exe, and then start Regedit.exe.</li> <li data-xf-list-type="ol">Locate the following registry key:HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices</li> <li data-xf-list-type="ol">Find the drive letter you want to change to (new). Look for "\DosDevices\C:".</li> <li data-xf-list-type="ol">Right-click \DosDevices\C:, and then click Rename. Note  You must use Regedit instead of Regedt32 to rename this registry key.</li> <li data-xf-list-type="ol">Rename it to an unused drive letter "\DosDevices\Z:". This frees up drive letter C.</li> <li data-xf-list-type="ol">Find the drive letter you want changed. Look for "\DosDevices\D:".</li> <li data-xf-list-type="ol">Right-click \DosDevices\D:, and then click Rename.</li> <li data-xf-list-type="ol">Rename it to the appropriate (new) drive letter "\DosDevices\C:".</li> <li data-xf-list-type="ol">Click the value for \DosDevices\Z:, click Rename, and then name it back to "\DosDevices\D:".</li> <li data-xf-list-type="ol">Quit Regedit, and then start Regedt32.</li> <li data-xf-list-type="ol">Change the permissions back to the previous setting for Administrators (this should probably be Read Only).</li> <li data-xf-list-type="ol">Restart the computer.</li> </ol></blockquote>

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