The more detail you give the better our advice becomes
I actually have a compaq v6000 that I just did a reinstall from an ordered set of recovery dvd's with windows media center 2005.
I have a client with a HP m7060 I just created the recovery dvd's for, also WMC 2005, and have a complete wipe and restore plus backed up documents and personal files scheduled for.
If you want an OOB (out of box) setup with all the software (including the useless junk) With the model number and maybe the serial number/ service tag, we can point you towards the step by step. If you need something else, you have to give us enough clues to tell what that is.
If you just want the volume thingy back tell us whether you use the hp keyboard that came with the system which has a horizontal volume control, or a remote (which some mediacenter pc's came with) and every other detail of the system since you may not recognize a relevant detail.
And also check the audio properties in control panel, sounds and audio devices, and see if the little radio button is checked to "place volume icon in the taskbar". The simple things can be elusive.
The media reader software varies from model to model, and I have killed it on purpose in a few since some early models make every slot in the thing have a drive letter as well as the camera mount, which confuses the user. The models of hp that have media center installed in them are often sold as "media center computers" and include the multi card reader, a camera and a built in dock for it, a tv tuner card and mpeg capture card or software or both. The complex mix of OEM software and WMC can often leave a complete recovery to OOB as the least painful option when some major component stops working.
The drivers page for your specific model should have the drivers for that component.
There might indeed be a way to repair or re-enable the items you are missing, but you have to describe them in a way that allows us to figure out what to do. It is only our wide experience with thousands of computers that made the previous guesses possible.
Edited by Ken-in-West-Seattle, 27 November 2009 - 01:49 PM.