DVD won't play sound

Sorry, this isn't exactly related to sound, but I didn't know where else to put this.

I have some DVDs with enhanced computer content and I use Interactual Player to play them. Soem of these features work properly, but most don't have sound. I know that the reason for this is because Interactual Player isn't compatible with Vista. So I need to know: Are there any other programs that can play ENHANCED CONTENT? I'm not talking about the actual movie and the special features you can play on a TV, I'm talking about features that you can only use on a computer, but you need a special program to run (usually Interactual Player)

Any help is greatly appreciated!
 

My Computer

My Computer

System One

  • Manufacturer/Model
    Lenovo Thinkpad T400
    CPU
    Intel Mobile Core 2 Duo P8700 @ 2.53GHz
    Motherboard
    LENOVO 64734VM
    Memory
    2.00GB Single-Channel DDR3 @ 531MHz
    Graphics Card(s)
    Intel Mobile Intel 4 Series Express Chipset Family
    Sound Card
    Conexant 20561 SmartAudio HD
    Monitor(s) Displays
    15 inch
    Screen Resolution
    1280 x 800
    Hard Drives
    1x 180GB Intel 530 series SSD
    1 x 120GB Hitachi 5400rmp
    1 x 650GB Western Digital Elements 5400rpm
    1x 1Tb Western Digital Elements 5400rpm
    Internet Speed
    Medium for New Zealand
    Other Info
    Weakest part of my computer is the graphics chipset.
    Only ever used a laptop.
    Also use USB Freeview TV Card
    Lenovo Docking Station
    External Speakers
    Other bits a pieces as needed
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