title: Qt program deploy
body: <p>I just wrote a Qt program, and build it under Release type, it work fine in QtCreator, but if I double click the exe in windows, it says it can't locate something in QtCore4.dll, so which QtCore4.dll should I actually add to it's folder? I'm using Qt4.7.3</p>
  
  <p>Btw is it because I installed TortoiseHg? and it messed up with the envoiurnment vars. But I did copy QtCore4.dll from my QtSDK folder. And it still doesn't work.</p>