"Extend volume" is not working in Windows Vista

I am using Windows Vista Home Premium Service Pack 2. I have now 4 volumes "C:", "D:", "E:", "F:". Now I shrink 30 GB space from my "C:" drive. I want to extend any of the "D:" or "E:" drive with the free space. But when I am right clicking on any of these volumes, "Extend volume" option is disabled. How can I extend this volume?
Some Screenshots are given below:

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You can't extend backwards on the drive, only forwards. That space will only be available to your C: drive.

To manage your partitions more effectively, check out this question:

windows 2008, Resize partition