Hello and welcome.
Uninstall AVG in safe mode using the tool found here:
AV Uninstallers - Windows 7 Forums
Reboot and install MSE to replace it.
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Download/install the latest audio driver VIAŽ VT1708S from here:
viahduaa viahduaa.sys Tue Jun 02 04:55:21 2009
http://www.viaarena.com/Drivers.aspx...=55&CatID=3510
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Install "ASUS Ai_Suite V1.06.20 for Windows 32/64bit XP & 32/64bit Vista& 32/64bit 7." from the utilities section here, to update the following old driver:
AsIO AsIO.sys Mon Dec 17 04:11:49 2007
http://usa.asus.com/product.aspx?P_ID=vk9Pqxby9MjO0WHm