Tv Tuner Problem: Any Idea???

hello guys.please i need some help.
recently bought a hp laptop (pavilion dv 6700) with hp digital/analog tv tuner.tried installing it using the window media centre  wizard (and nigeria as country settings )but it didnt pick any signal. later changed country to uk and now i can pick several stations .however not getting any audio.i've tried several stuff- reinstalling the hp card driver but still no sound.meanwhile audio for other appliances working
anybody got a solution?
thanks

thanks but i've tried that but didnt work.