another problem again!!!! :(

i am about to begin in making D3D hack(copy-paste code) in warrock... but i got this problem when i build may hack.......



1>------ Rebuild All started: Project: John's Hack, Configuration: Release Win32 ------
1>Deleting intermediate and output files for project 'John's Hack', configuration 'Release|Win32'
1>Compiling...
1>Quelle.cpp
1>.\Quelle.cpp(15) : fatal error C1083: Cannot open include file: 'D3DX9.h': No such file or directory
1>d3dmenu.cpp
1>c:\users\johnadams\documents\visual studio 2008\projects\john's hack\john's hack\d3dmenu.h(5) : fatal error C1083: Cannot open include file: 'd3dx9.h': No such file or directory
1>Base.cpp
1>.\Base.cpp(2) : fatal error C1083: Cannot open include file: 'd3dx9.h': No such file or directory
1>Build log was saved at "file://c:\Users\JohnAdams\Documents\Visual Studio 2008\Projects\John's Hack\John's Hack\Release\BuildLog.htm"
1>John's Hack - 3 error(s), 0 warning(s)
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========




what is the main problem?




im using Visual C++ 2008
my OS is 64bit windows 7