qt app not responding in window XP

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Hello everyone,

I'm using QT 4.7 in window 7 but i need to give my app to my supervisor and he is using window XP without any QT software installed.
so i build the app using release and put all the libraries need in the release folder, it work perfectly when i used it outside of the qt window.
But then, in window xp, the app can be execute but every click on the gui need window refresh.

its the problem with the os?? how can i solve this?? help me..

thank you in advance..