Windows 7: Enable Nvidia graphics card to output sound.

Hi, I really need help on this matter, hope you are all well. I hope you guys can help me, it would really be appreciated. Thank you.

I am using Windows 7 Ultimate. Anyway I have installed a new graphics card (Nvidia). Everything is running perfectly. The graphics card is audio capable through it's HDMI port which is connected to my TV. I have a Onboard sound card which I am currently using. I am using a 2.1 speaker system. Now I would like to use my NVIDIA card, to have sound through my TV. I have tried to disable my onboard sound card. It did not work. Weird thing though, I COULD NOT find my onboard sound card in my BIOS. Also a quick note; When my TV is not muted, the speakers make a crackly sound. WHAT IS GOING ON?



So the question is how do I do such a thing?
How do I get sound out of my HDMI on my graphics card (yes I have clicked enable sound on my graphic card) I would really appreciate it please. Thank you