Can you answer the following questions:
What is the exact component name and version of your Realtek High Definition Audio?
Is the driver RTKVHD64.sys version 188.8.131.5296 the latest version?
"I've downloaded the driver several times, but it keeps telling me that the problem is still there." What do you mean by "telling me that the problem is still there"? Are you getting any error messages?
"I did a driver scan and it is showing other Realtek items that are needing to be upgraded" What other Realtek items need to be upgraded?