ITunes 10.7 won't send 5.1 audio out, all other apps/games work

Hi all,
  I'm trying to get the videos I bought on iTunes 10 to play in 5.1 out of iTunes on Windows 7. The videos have Stereo and 5.1, as per their "Get Info". PowerDVD, WoW, all other apps and games playback 5.1 audio on my system perfectly, as do 5.1 videos using VLC.
When playing an iTunes video with stereo and 5.1 audio, stereo plays fine, 5.1 is silent when I switch to it.
I read that Quicktime's preferences need to be set. I did that. 5.1 audio, 16-bit, 48k. Still nothing.
The audio device is SoundMAX which came with my Asus P5E. Drivers are updated.
The same thing happens when setting my audio device to my Logitech G35 5.1 headphones.
This seems to be more of a Quicktime/iTunes problem than a driver problem since everything else works.
Or, does iTunes/Quicktime Player simply not work with 5.1 properly on Windows?
Any help would be appreciated.

Many thanks b noir for pointing me in the right direction.  I now have iTunes 10.7 up and running and it works fine.
After your question I was sure I didn't have a smart card service and searched for ways to reinstall it.  I also was advised by my computer literate brother to recheck Windows Updates for Smart Card services.  I found the (long ago hidden by me) Microsoft Base Smart Card Cryptographic Service Provider Package (KB909520) and ran that update.  Then I retried the process I found at a web site named lazybit.  The specific URL for that one is
http://lazybit.com/index.php/2007/12/19/windows_xp_re_install_smart_card_service  if anyone needs it. 
I'm honestly not sure which piece did what but I now have a service named Smart Card Helper, and iTunes opens just fine.  Good enough for me - thanks again!!

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