running error

I'm using Qt 4.3.2 open source, and after i finish building the program and try running it it displays this message:
"This application has failed to start because Mingwm10.dll was not found. Reinstalling the application may fix this problem"
even though when i run Examples and Demos the run normally

The location/path of Mingwm10.dll is not in the PATH environment variable.
You need to modify the PATH and add the dll-location:
http://support.microsoft.com/kb/310519