Prototype :: Windows 7 XAudio2 problem

Prototype is a game about a man changing shape. It is very enjoyable game. I got prototype while I was using vista. So after installing it in to my PC I haven't encounter any problem. However this might be because I had both service packs installed in my PC. So I recommend if you are a vista user please install service packs or you might have troubles.
However after I got Windows 7, I installed Prototype again this time there was an error saying 'XAudio2 cannot be found'.
After searching for a while I found a directX version which contain this file.
http://www.microsoft.com/downloads/details.aspx?FamilyId=2DA43D38-DB71-4C1B-BC6A-9B6652CD92A3&displaylang=en#QuickInfoContainerHere is an article for further details,
http://www.programmerfish.com/how-to-fix-prototypes-could-not-find-xaudio2-error-on-windows-7-and-vista/My problem was solved after installing the directx version. So try it.