Demon's Souls not working

·F 0:00:08.367828 {Audio Thread} class std::runtime_error thrown: No supported XAudio2 library found

Install software system requirements on the website
You're missing https://www.microsoft.com/en-us/download...aspx?id=35

But why?
The thing is that I have that already installed, i checked the software system requirements before posting and downloaded al the things to check if something was missing and no.

I already have that installed

Are you using Windows 7 Ultimate 64bit?