Redhanded,
What audio driver are you using? If it's ASIO, try changing to MME and see if that makes a difference. (ASIO can sometimes cause unexpected behaviour.)
Also, navigate to c:\bb\Realtracks and enter one of the directories of Realtracks. Doubleclick on one of the wma files and see if it loads.
Let us know what happens.
Regards,
Noel