i have no realtek driver for win7 intel915GAV motherboard. i have no problem with win7 built in sound driver. but any microphone i plugged in my motherboards red/pink jack then win7 couldn't find the device i plugged in. but in win xp it is sucessfully work.
http://www.realtek.com/downloads/
http://www.intel.com/p/en_US/suppor...Don't know if this helps, but I tried!
Ciber..
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