Talk:QPSQL driver not loaded - unusual solution
From QT Wikipedia
This libraries need to by copied from {%pgsql)\bin\ files to executable directory to make qsqlpsql driver load properly.
It is a good choose to use DependencyWalker[1] on qsqlpsql DLL.
It shows which libraries are needed.
comerr32.dll gssapi32.dll k5sprt32.dll krb5_32.dll libintl3.dll or libintl-8.dll (windows/postgresql 8.3) libpq.dll
