keyboardwindowswindows 7
I am using Windows 7 professional 64 bit on a desktop. I have a Microsoft Sidewinder X4 keyboard. Its has volume buttons for volume up/down and mute. I can confirm that the buttons physically work. I can change volume just fine in my Ubuntu partition. Why do my volume buttons on my Microsoft keyboard not work under Windows?
This is my device manager:
Some USB devices are made up of several subdevices. Your keyboard is likely one of them. This is perfectly normal.
To illustrate, here's a screenshot of my configuration, consisting of one keyboard and one mouse (Logitech G700):
The Delete Volume and Change Drive Letter and Paths... options for your drive D: are not available because there is a Page File on it. If you take a close look at your first picture, you can see that the text under IT World (D:) reads Healthy (Page File). Before you can delete that volume or change its letter, you will have to tell Windows not to put a page file on it - if you need help with that, see the top answer in this question and set No paging file for drive D:. Once you've done that, reboot. The options to delete and change letters should now be available.
The Extend Volume option is not available because partitions on Basic disks can only be extended if there is free (unallocated) space remaining on the same drive and that free space is directly adjacent to the partition you wish to extend. In your current setup, there is no free space left, but if you delete volume D:, you will be able to extend drive H: (and only H:). If you wish to extend a drive different from H:, you will need to delete a different partition or consider converting your disk to a Dynamic disk. To do that, check out the official guide, but make sure you understand the dangers and implications of Dynamic disks first.
Best Answer
As explained in an answer to your other question, the extra devices are normal.
As for your question, there's a answer here (by William.Wade.II) suggesting that the HID service may not be running. Open the control panel, Administrative Tools, Services and look for Human Interface Device Access. If not running, click "start" and see if that makes the buttons start working. If it does, right click the list item and click properties, and change startup type to automatic.
However, it is likely that you haven't installed the drivers for the keyboard. If you haven't, then do so.