Driver not loaded

I try deploy my Qt application to other computer. I'm use PostgreSQL for database. And I have copy all library need in folder where my exe saved. I copy all Qt library and Postgres library. I copy sqldrivers folders too. But, If I try run my application, I always get "Driver not loaded" messages.

I try delete key "HKEY_CURRENT_USER\Software\Trolltech\Organization Defaults\Qt Plugin Cache 4.5.false", and run again my application. But still get "Driver not loaded" messages.

This is my folder structure

Code:

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TAHEDE
TAHEDE\tahede.exe
TAHEDE\QtCore4.dll
.............
.............
TAHEDE\libpq.dll
.............
.............
TAHEDE\sqldrivers\qsqlpsql4.dll
TAHEDE\sqldrivers\qsqlpsqld4.dll

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Btw, I'm use Ms. Windows and build my application with Release build mode.