First, update all of your sound / video drivers and try using my client:
Use
5.2
Second (if that doesn't work):
Open your start menu and type in "msinfo32".
Open that up and copy and paste the System Summary into a spoiler.
Third:
go to the start menu and type in "dxdiag".
Say "Save all information" and upload the text to your next post.
Tell me your default sound and display devices.