Hi Im using Windows Vista HP SP1 and have a Realtek HD audio sound card. However I want to upgrade since I have a Philips HTS3100 Theatre System. This provide awesome sound when I play a DVD but obviously I lose this when I plug it into the Realtek sound card. This is because the HTS3100 uses a red and white audio cable to jack so im only plugging it into 1 hole not subwoofer into the correct hole for example. Hence im not getting the 5.1 surround sound

Any sound cards out there that would work with the HTS3100 perfectly? Sorry if im not being clear
Basically I plug a jack into the green port in my Realtek soundcard. This jack turns into a red and white audio cable that i plug into the HTS3100 therefore im not gettign 5.1 surrround since Vista things im just plugging 2 speakers in!!

Could I get a sound card that support just the 1 jack with red and white cable to get the 5.1 surround? Thanks