Windows 7 - Microsoft Wireless Keyboard 3000 v. 2 not responding to all keys

I have had this keyboard for around 2 years now, and it has always been functioning pretty well. Now, when I try to use the volume control keys on my keyboard they don't work anymore. I have the correct driver for my Microsoft Wireless Keyboard 3000 v.2, and the most up to date Intellitype software needed for the keyboard from the Microsoft website. All the other keys on my keyboard are functioning but the volume control keys. Any help would be appreciated!

It seems that I've solved my own problem. After searching around on the internet I found this link "Resolve Hotkeys or Volume control keys not working on Microsoft keyboards"

After going through all the methods recommended, the fourth one worked out for me. The problem was that my Human Interface Device Access was not on. The volume controls started working for me.