Sound problems Win7 Bootcamp iMac (Intel-Based) Mid-2011

I was using Windows 7 Ultimate with my iMac's Bootcamp. It was working fine, then when I used my Mini Display Port to HDMI to my TV, it stopped working. When I plug the cables into my TV, the sound comes from there. But when I unplug them, it doesn't.

And yes, I did enable it and make it my default playback device.

http://gyazo.com/eb717ef36d64680f1eac5761381270cb

These are my specs.

http://gyazo.com/efca3bc6d9f2a9ebe14f957075af0e3f

I tried to install new Realtek Drivers for my -High Definition Audio Device- and that still didn't work. I also tried deleting my bootcamp partition and creating a new one and that didn't work either. I have no idea what to do and and I've looked all over the internet. I forgot to add that on the OS X part of my partition, the sound works perfectly. On the windows 7 part, it doesn't work at all. Help would be much appreciated.