Itunes and mp3 files

[#1]

The recent thread on here about itunes and vista prompted to copy my music library to an old PC where I have itunes running with firefly media  server.
http://community.plus.net/forum/index.php/topic,98305.0.html
All is fine and it means that on my main machine I can avoid the resource hogging bonjour etc. but there is a problem on the machine running XP SP3 with iTunes 10.5 -  it wont play mp3 files properly.The files fire up but are so distorted as to be unrecognisable. I can't fathom out why that is. I've done a clean install of itunes but no luck with the mp3 files and I've no idea why? can anyone give me a clue? Does iTunes need something installed in \windows to let it play mp3s?

[#2]

Have you tried setting a different output method in the QuickTime control panel?
Try DirectSound, but if that fails, drop back to waveOut.

[#3]

I hadn't bu tit makes no difference I'm afraid

[#4]

Is it a dual core AMD CPU? If so, make sure that the AMD K8 Cool'n'Quiet driver is installed or you will get some screwy issues with some mutlimedia apps with respect to timing.
Are the MP3 files stored locally on the XP system, or are they being served across the network via Firefly?

[#5]

Thanks for your help here.
It is an AMD processor. not sure if its dual core or not Its quite an old machine so I doubt it.
I have had itunes running on it and happily playing mp3s and AAC in the past but I recently did a clean install and havbe had a problem since then.
Most of my music is in AAC ripped from CD. All the music  is stored on a second HDD ( the original HDD is only 40GB so that has the OS and the program files on it).  I'm using it mainly as a music server for firefly and my old roku soundbridge plus as a spare machine for internet use.
Thanks again

[#6]

https://discussions.apple.com/thread/3372304?start=60&tstart=0
Looks like th AMD processor is the problem here.

[#7]

Just in case anyone was following this trhread itunes 10.5.1 appears to cure the problem of MP3 file playback onm AMD processors