Possible Work Around
I was having the problem with Windows 7 64 Premium. I found this work around for my Realtek Realtek ALC883 on a forum about a Creative soundcard, it worked for me, if you have more than 4 GB of RAM this probably isn't a good solution for you, but if you only have 4 GB then 1 MB less RAM to solve the audio problem is worth it. I've rewritten the instructions to apply to the Realtek issue:
:WORKAROUND:
You can use this as a temporary work around until it is resolved by MS or Realtek, without removing memory (RAM) physically (which also resolves this problem).
1) Uninstall all Realtek Drivers
2) Uninstall the High Definition Audio Controller under Device Manager > System Devices
3) Run MSCONFIG from...