Error! failed to play test tone.

Greetings. The audio on my Samsung laptop (model no: np450r5e-x03gr Windows 8.1) stopped working suddenly. For the past few days I have tried everything I could but the sound is still not working. I have searched all the forums and performed many tasks some of which include:

-system restore
-re installing the drivers properly
- " Start --> Run --> services.msc " and from there restarting Windows audio
- installed "Malwarebytes Anti-Malware" and "McAfee OAS" to get rid of suspicious staff
- I performed the following scan: " Start > Run > cmd > sfc/scannow " which after completion I got the following: Windows Resource Protection found corrupt files but was unable to fix some of them. Details are included in the CBS.Log windir\Logs\CBS\CBS.log. For example C:\Windows\Logs\CBS\CBS.log. Note that logging is currently not supported in offline servicing scenarios.

I can no longer live without sound! Any suggestions for what might be the problem and how it could be solved?

Thank you!