I recommend you to perform the following steps to isolate the issue and arrive at a fix: Are you the administrator on the laptop?.Did any software changes or updates happen on your laptop recently?.This link will help in finding the model number: What is the exact laptop model number.To assist you with accurate information I would require more information regarding this: I appreciate your efforts in troubleshooting this issue and have certainly done a good job. You have tried to install the drivers and an error appears with a code.
During troubleshooting, you got a message saying 'there was something wrong with the realtek HD audio driver'. I understand that you have an HP Pavilion 14 series laptop and there is a red cross on the audio icon. I came across your post and would like to assist.