problems with dts

Im having problems watching dvds in dts under Windvd 7. When I turn on dts a window comes up saying "dts decoding is not supported by this version of Windvd. Please select another audio track or visit www.intervideo.com to upgrade Audio Booster with dts support". If I go to the site and look for upgrades it tells me "You have the newest version of WinDVD 7 Platinum No upgrade is available at this moment." .I have a sound blaster audigy 2 zs platinum with the most recent drivers.