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Can't connect to qsqlite plugin

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On OS with installed QT – everything works. But if QT not installed – i see some bugs… Programm can’t view plugins and crashed with runtime error if the creation of the base is in a separate class CDatabase. If the content CDatabase :: CDatabase i moved to MainWindow :: MainWindow – everything works. Any ideas? OS: Windows XP / Windows 7 ×64 Full source code (failed on OS without QT): http://pastebin.com/6Q2Jtn57 Full source code (working on all OS): http://pastebin.com/C8KfZ1NB mainwindow.cpp #include "mainwindow.h" #include "ui_mainwindow.h" #include "cdatabase.h"   CDatabase db;   MainWindow::MainWindow(QWidget *parent) :     QMainWindow(parent),     ui(new Ui::MainWindow) {     ui->setupUi(this);   }   MainWindow::~MainWindow() {     delete ui; } cdatabase.h #ifndef CDATABASE_H #define CDATABASE_H   #include <QtSql/QSqlDatabase> #include <QtSql/QSqlError> #include <QString>   class CDatabase { public:     CDatabase(); private:     QSqlDatabase db; };   #endif // CDATABASE_H cdatabase.cpp #include "cdatabase.h"   CDatabase::CDatabase() {     QString connection = QString(QSqlDatabase::defaultConnection);     if (QSqlDatabase::contains(connection)) {         db = QSqlDatabase::database(connection);     } else {         db = QSqlDatabase::addDatabase("QSQLITE", connection);         db.setDatabaseName("db.sqlite");         db.open();     } } main.cpp, mainwindow.h, wolqru.pro – not important. For source code see link above. List of files in program dir: platforms\qwindows.dll platforms\qminimal.dll sqldrivers\qsqlite.dll wolqru.exe Qt5Core.dll libgcc_s_sjlj-1.dll libstdc++-6.dll libwinpthread-1.dll Qt5Widgets.dll Qt5Sql.dll Qt5Gui.dll libGLESv2.dll libEGL.dll icuin49.dll icuuc49.dll icudt49.dll D3DCompiler_43.dll

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