Unable to inject DLL into any process on Windows 7 x64

[Tomtombinary]

On Windows 7 x64, when i try to inject DLL into calc.exe process,

tasklist
[...]
calc.exe 6004 Console 1 14 772 Ko
[...]
inject.exe 6004
it's give me :
[-] Failed to inject the DLL. Error=5 (Access denied)
I tried with the x64 and Win32 configuration, and also with user/administrator rights, but same error.
Why it doesn't work ?

[pgfsim]

Try using inject.x64.exe instead