In order for us to provide better support, we need to see the log generated by citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File
Download the Windows Media Feature Pack through Windows update. If you don’t have an AAC decoder, then you likely have a Windows “N” version. Installing the Media Feature Pack should solve that.
“Won’t work” Could you elaborate? Also, if you’re having issues with the latest Canary or Nightly builds, upload a log file: How to Upload the Log File