No audio output device is installed

my realtek audio high definition sound device appears to have uninstalled itself - leaving the message 'No audio output device is installed' and I can't work ou how to reinstall it.Through the devicemanager I have found out that the device is not digitally signed - code 10 eror!
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More about audio output device installed
  1. The problem can be solved by re-installing the driver. Go to your motherboard / audio card / laptop manufacturer website and search for drivers for your particular model and operating system.

    If the problem persists, we will need to know what hardware and operating system you use.
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