Windows 10 newly built pc audio

Hello I recently built myself a gaming computer.
This is the screen shot of what I have for you, my audio does not work in the front, or rear port jacks. all I have is a red x next to the speaker icon.
Ive tried uninstalling AMD high def audio and restarting, ive tried updating it but it says its up to date. when I click on properties of the AMD high def audio it says it is working properly. I've tried downloading realtek and installing but I can not locate the file, it seems to be non existent.
Im plugged into a mintor with a hdmi cable from my graphics card. I'm at a loss, I've researched and tried everything I know. Help will be much appreciated!!
 

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Update.....
using "add a legacy hardware" and selecting realtek, this is now what I have
 

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