These all were blamed on a driver
HDaudio.sys which is part of the OS. I would run a system file check to verify and repair it.
Run a system file check to verify and repair your system files.
To do this type cmd in search, then right click to run as administrator, then
It may need to be run up to three times before sucessful
Read here for more information SFC /SCANNOW Command - System File Checker
Let us know the results from the report at the end.
Old d rivers needing updating
RTCore32.sys 5/25/2005 1:39:05 AM 0xa1cac000 0xa1cad200 0x00001200 0x42941d89
mdvrmng.sys 5/28/2007 9:37:13 AM 0x9bfc0000 0x9bfd4000 0x00014000 0x465ae919
fetnd6.sys 6/19/2008 6:45:41 AM 0x99b4f000 0x99b59c00 0x0000ac00 0x485a46e5
ssmdrv.sys 5/5/2009 5:05:18 AM 0x90324000 0x90329a00 0x00005a00 0x4a000f5e