Found the issue of "...several error messages from the devices like "Can not open soundcard" or "Error in Sound Input" or "Unrecognized error"... !
Uninstalling of the Driver Package was not required!!!
The programs (apps) controlling the devices did not granted anymore access to the soundcard due to changes of privacy settings (Start-> Privacy settings). I noticed that the same problem was also happening on my laptop. The laptop and pc recently got a Windows update. Maybe with this update the privacy settings were affected. So I keep an eye on it next time.