There is a problem with the Windows Audio service - that's the problem that you saw when running the troubleshooter.
Where did you update the AMD Radeon HD8400 from? The PC manufacturer's website, or from the AMD website?
What's the make and model of your system?
Start with this (aimed at fixing the Windows Audio service - not the device manager thing):
Then please run the following DISM commands to see if there's any problems with the system (from an elevated (Run as administrator) Command Prompt). Press Enter after each one:
Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /RestoreHealth
FYI - I have repaired systems using the last command even though problems weren't found with the first 2 - so I suggest running them all.
From this article: http://technet.microsoft.com/en-us/library/hh824869.aspx
You can also run sfc.exe /scannow from an elevated (Run as administrator) Command Prompt to check for further corruption.
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