[Davy Van dingenen]

The above did not seem to work for me as there was no premiere schortcut in the destination folder.

Anyway, by piecing out different parts in my project. I found out that a pitch shifted audio was the cause of having no sound. I deleted the pitchshift effect, and voila, it works.

[Davy Van dingenen]

I found this on some other fora.

Solution:
Create a shortcut to the Premiere Pro executable file, rename the shortcut to Premiere, and move the shortcut to C:Program FilesCommon FilesAdobedynamiclink.

Detailed Steps:
Close all Adobe applications.
In Windows Explorer, navigate to C:Program FilesAdobeAdobe Premiere Pro CS4. (If you installed Premiere Pro CS4 in a location other than the default of C:Program FilesAdobe, then navigate to your custom installation location.)
Right-click on Adobe Premiere Pro.exe (which might appear without the .exe extension) and choose Create Shortcut.

Hope this works for you.

Davy
Rename the newly created shortcut to just Premiere.
Important: The name of the shortcut must be exactly Premiere with no other characters.