After move from win7 to win8 I’ve got 2 problems, the second of it – notebook not shutdown or reboot correctly, just you have got minidump with smile.
The minidump file shows a SYSTEM_THREAD_EXCEPTION_NOT_HANDLED with error caused by the HSX_CNXT.sys
Go to Computer Management tool and disable:
* HDAUDIO Soft Data Fax Modem with SmartCP
After that restart, and all is fine