Qt 5.1 Application doesnt start in windows !!!

[omid_kma]

Hi
I release prject with Qt 5.1.0 for windows using Windows 32-bit (VS 2012, 511 MB) then I put necessary dll s Including plugin folder ( with this application
And then I run application in my own pc every thing works fine but when I tried other pc that doesn't contain Qt it doesn't start (no error just doesn't show any thing !...)
Things that I have done :
I installed visual c++ 2012-210-2008 Redistrutable packages
Putting all dll s even debug ones !
Putting plugins folder
not.jpg
I tried dependency walker but it seems nothing is missing !!

Note that I have same probem with mingw version of Qt 5.1 too !
I tried using this qApp->setLibraryPath(dir);
Thenit runs but still cant play sound (doesn't recognize multimedia dll this one I think dsengine.dll !!)
I use QMediaPlayer and QSqlite in my application and I added all necessary dll s

Any help?