Windows driver for "Multimedia Controller" and sound problem

Hi
I installed Windows 8.1 using Bootcamp on my Macbook Air (Early 2014, Intel i5).
Then I downloaded Bootcamp drivers from http://support.apple.com/kb/dl1720 and installed couple of them (wifi, intel chipset).
When I check the Device Managmer I still get "Multimedia Controller" in "Other devices" without drivers.
Beside that I think the sound is not working. I installed the Realtek sound driver. When I play sound file the volume bar in taskbar mixer is blinking but no sound is coming out : ).
Please help.

for multimedia controller if its onboard sound card use this drivers:
http://download.nvidia.com/Windows/nForce/4.62/4.62_nforce_audio_winxp2k_international_whql.exe
but based on both:
multimedia controller
multimedia video controller
think its external PCI device like TV tuner.
get this one to ID the device: http://www.zhangduo.com/UnknownDeviceIdentifier.exe

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