Hi, I've just come to the solution!!!
I'm going to explain below: I hope it will be useful for you.
When I installed the new Qt 4.5 bundle that includes QtCreator, the setup program created the folder D:\Qt\2009.01 and put everything there (please note that the default drive was C but I chose to change it).
Inside that folder you can find the following two folders (among others):
D:\Qt\2009.01\bin
D:\Qt\2009.01\qt\bin
Both of them contain QtCore4.dll and QtGui4.dll files.
It seems that the correct files are in the second one (D:\Qt\2009.01\qt\bin).
My mistake was that I got the files in the first one.
Max
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