no sound message something about dsound
 

I get no sound from anything : get message: this application failed to start due to dsound.dll not found reinstalling the application may fix the problem.
---- anything that should make a sound don't exept the modem

Re: no sound message something about dsound
 

The modem is producing sound because it has a built-in speaker of its own.

dsound.dll is part of Microsoft's DirectX multi-media support package; it sounds like your DirectX got corrupted somehow.

Try either reinstalling or upgrading your DirectX components. You can get the download's from Microsoft's site.