Simplest way to deploy your app on another PC with Windows is to copy necessary libraries from "C:\QtSDK\Desktop\Qt\4.7.3\mingw\bin" to directory with your EXE.
You should copy at least following libs:
Qt Code: 
  1. libgcc_s_dw2-1.dll
  2. mingwm10.dll
  3. QtCore4.dll
  4. QtGui4.dll
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If you use additional modules (QtNetwork, QtSQL etc.) copy also these libs.