Rebinding Keys on a Dell Keyboard

"It looks like you're going to need some additional software to do this for you. There's some excellent links here and here.

In particular:

NirCmd is an application that changes the volume and more.

Example of use:

* Increase the system volume by 2000 units (out of 65535)
nircmd.exe changesysvolume 2000

* Decrease the system volume by 5000 units (out of 65535)
nircmd.exe changesysvolume -5000

* Set the volume to the highest value
nircmd.exe setsysvolume 65535"

Another third party option for fine volume control, volumouse (also from Nirsoft)