Hey there. Update this driver:
cmhdav cmhdav.sys Mon Oct 19 05:11:45 2009
for your C-Media Oxygen, Asus Xonar or similar.
It would also be good to update this:
ASACPI ASACPI.sys Sun Mar 27 22:30:36 2005
by visiting here: http://usa.asus.com/product.aspx?P_I...ntent=download
and downloading the Aisuite V1.05.32 for Windows XP /XP 64bit and Windows Vista /Vista 64bit Windows 7 32bit/64bitand installing. It's in the utilities section of downloads.