Tv Tuner problem techcom internal ssd-tv 670plus

i bought this card 2-3 months ago...then i had xp. i installed drivers maually and it worked.

now i have vista and the drivers given with card get installed, the problem is that there is no sound. the channels are displaying but without any sound..
also windows detect it as flytv prime 30..both xp and vista. so drivers are installed manually.

kindly help me solve this problem. i dont want to set up xp again just for tv card...please help..