Why change my drive letters?

Original title: why the drive letters disappear from my computer? the letters are also missing from disk management, the readers are there, with new letters!

several of my drive letters changed and the drive letter are absent from the disk management and administration tools, disks are ther with new letters and I can't rename change drive letters?

Hello
Are you are still unable to change following the steps in this article the list?

http://Windows.Microsoft.com/en-us/Windows7/change-add-or-remove-a-drive-letter

Tags: Windows

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