Loss of Audio and Browser / OS Crashes (Panasonic CF-52 Toughbook - MK3)

Recently (past day or so) I have noticed a loss of all audio (Internal Speaker and External Headphone Jack). All indications that audio is being processed internally by the audio card as in all cases the metering for differing functions is active in correspondence
with the test sounds or music that is being played with no audio being played on the speakers or earphone jack.
Also after reading much on this being a common difficulty... I attempted a system rollback which was not successful through multiple restore points to when the OS was built.
I have tried removal of the audio drivers (All) and allowed the OS to re-install at re-boot which had so far not restored any audio to be heard. Close assessment of the audio at full volume did not reveal any noise or decreased audio. Also, upon reboot the
audio indicator in the lower right tray repeatedly initializes in a muted condition. Even with unmuting this does not restore the audio.
Another observation. This morning I upgraded to the latest build. Upon the OS stabilizing from the post build upgrade to the latest, the equipment was able to access the network / Internet. Upon initializing either IE Explorer OR Mozilla Firefox without
displaying any target webpage the OS would crash and self reboot each time. I then rolled back to the previous OS Build.
Hardware:
Make:             Panasonic Toughbook
Model:            CF-52 (MK3)
Audio Card:     Conexant 20584 SmartAudio HD, w/ High Def. Audio Device
                      Conexant Driver: 4.115.0.60 (3/23/2010) / High Def Driver: 6.4.9879.0
Video Card:     AMD Mobility Radeon HD 5000 Series
                      Driver: 14.201.1008.0
Processor:       Intel(R) Core(TM) i5 CPU    M 540 @ 2.53GHz
RAM:              8GB (4GB x2)
OS:                Windows 10 Preview (64 Bit), Clean install w/ addition of applicable Panasonic Win 7, Win 8.1 Drvr OS Build   9879
Hard Drive:     Western Digital 500GB, WDC WD5000BPKX-00HPJT0 (Purchased a week ago specifically for this testing) When Win10 Enterprise becomes stable (Production) it will be loaded onto a Crucial MX100 2.5 SSD for use.

I've been tracking some issues on the Conexant drivers. Can you send me a DxDiag.txt and your c:\windows\inf\setupapi.dev.log file to "mediaq at Microsoft dot com"?
Thanks!
John W [MSFT]

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Loss of Audio and Browser / OS Crashes (Panasonic CF-52 Toughbook - MK3)

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