Real Tek Sound Card not working

#1
I have installed windows 7 64 bit everything works fine but windows 7 unable to install audio driver,, I installed the new driver from my manufacturer (intel) site ,the driver installed successfully but still no sound and windows 7 says "no speaker or headphone plugged in"


My systems specs are

Intel Core 2 Duo E4500
DG33FB
Realtek HD card
 


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