Windows 7 on MacBook air – sound not working

After installing Windows 7 on my MacBook air ( bootcamp ) everything worked perfect and all drivers succesfully installed , the only thinking working is my sound .
But on device manager everything is correct , turned on Windows update , even reinstalled The driver manually But still nothing ,….. Any help would be verre apriciated
Answer #1
http://www.technews.biz/macbook-having-windows-7-audio-trouble-weve-got-your-driver-fix-444/
Answer #2
sry m8 does not work :s