I think this is included in DirectX 9.0 and shouldn't be updated by the .dll file alone. This can cause your entire system to crash to do mismatch's in versions of files in the DirectX files. You can get the latest version from Microsoft at:
http://forum.mtu.com/showthread.php?threadid=772
Also, I would make sure to run all of the Windows Updates by connecting to the Internet then click the Start Menu, Windows Update. Make sure that you do all of the Windows Updates for your version of Windows.