Itunes has choppy/jerky playback since update to 10.3.1

Hi hopefully someone can help me here as I've run out of ideas.
I have a mac mini with windows that I use to run my media center.  I stream movies from my NAS box via itunes.  This has worked great until yesterday, with smooth playback even whilst recording two other channels.
I upgraded to 10.3.1.55 last night and now the playback is laggy/jerky, the audio sync rapidly gets out and it seems to drop every other frame.  I've checked the network and windows and vlc are both able to playback perfectly.  I then tried playing directly from the local hard drive and that had the same problem.
I uninstalled itunes and reinstalled 9.2 with a fresh library and it had exactly the same problem.
I'm not sure where to go from here.  Does anyone have any suggesti
thanks
Andy

I forgot to add that I am running windows 7.  CPU usage during playback was only about 40%.

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