Choose the info below from the drop down and then click on search, after that you will be able to choose Op system, then you will be taken to the driver download page for your board and Windows 7. The Windows 7 audio drivers for your board are there.
Motherboard:
Socket AM2/AM2+/AM3
M2N68-VM
My Computer
At a glance
Windows 7 Ult, Windows 8.1 Pro,Q9650-4.275GHz, E8600 4.5GHz, E6750-3.8GHzG.Skill PC2 9600 1200Mhz 5 5 5 15 2TGTX480