Hi,
there seems to be a problem with the installer.
If you try to install the software in another folder instead of the suggested one (C:\PROGRAM FILES\... ), then some of the .dll files cannot be found and this results in "no sound" even if the program seems to load fine.
You should try to re-install the demo on the C: drive again (use the PROGRAM FILES folder) and it should be okay. As far as I know this is also true for the full version and is not restricted to the demo.
Cheers
Fr@nk