Alright. So, Every time I start up Itunes
A message pops up before it opens and says

<b>"Itunes has detected a problem with your audio configuration. Audio/Video playback may not operate properly."</b>

It isn't just the audio on my Itunes, NOTHING will play on my computer. I have no sound whatsoever. Everything is "Un-muted" And my speakers are attached.

I visited some help sites and it said to re-download Quicktime, which I did. but nothing happened.
Every single site that I have visited has said the same thing, or to download something from Microsoft which I tried but nothing happened. Also, yes i've downloaded the latest version of Itunes.

I have a Windows XP

Help me get the sound back?

Uninstall and reinstall your sound drivers.

How can I distinguish which one that is, and where/how can I reinstall it?

If you don't know how to do it already do not attempt it. Get someone who knows what they are doing to help.

Otherwise you just risk making a very big mess.