Windows Vista Home Premium 32 Bit-Sound Problem.

Question

I am running 32 bit Windows Vista Home Premium and have a Hp Pavilion dv9700 Notebook PC. AMD Turion 64x2 Mobile
Technology TL-60 . My sound
card is Conexant High Definition Smart Audio22. I am trying
to broadcast streaming video (.avi files) to justin.tv but there is no
audio on the streaming end...people on the net cannot hear the movie. I
am able to hear it with my speakers. I have been told that I am unable
to get a
stereo mix or line in. I have scoured the net looking for help, from
installing drivers (this seems to be the general consensus as to the
problem) to installing VAC (video audio cables) to spending hours on
the phone with HP...but no success. Can you please recommend a way for
me to be able to sort this
problem out?Thanks very much,