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

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.

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