diff --git a/articlewebview.cc b/articlewebview.cc
index 1d412386..af5bedf5 100644
--- a/articlewebview.cc
+++ b/articlewebview.cc
@@ -162,7 +162,7 @@ void ArticleWebView::wheelEvent( QWheelEvent *ev )
     SystemParametersInfo( SPI_GETWHEELSCROLLLINES, 0, &nLines, 0 );
     if( nLines == WHEEL_PAGESCROLL )
     {
-      QKeyEvent kev( QEvent::KeyPress, ev->delta() > 0 ? Qt::Key_PageUp : Qt::Key_PageDown,
+      QKeyEvent kev( QEvent::KeyPress, ev->angleDelta ().y () > 0 ? Qt::Key_PageUp : Qt::Key_PageDown,
                      Qt::NoModifier );
       QApplication::sendEvent( this, &kev );
 
diff --git a/fulltextsearch.cc b/fulltextsearch.cc
index 4c83f57f..02b24dce 100644
--- a/fulltextsearch.cc
+++ b/fulltextsearch.cc
@@ -17,6 +17,7 @@
 #include "initializing.hh"
 #include <qt_windows.h>
 #include <uxtheme.h>
+#include <QOperatingSystemVersion>
 
 #endif
 
@@ -248,8 +249,7 @@ FullTextSearchDialog::FullTextSearchDialog( QWidget * parent,
 
   oldBarStyle = 0;
 
-  if( QSysInfo::windowsVersion() >= QSysInfo::WV_VISTA
-      && ( QSysInfo::windowsVersion() & QSysInfo::WV_NT_based )
+  if(  QOperatingSystemVersion::current () >= QOperatingSystemVersion::Windows7
       && !IsThemeActive() )
   {
     QStyle * barStyle = WindowsStyle::instance().getStyle();
diff --git a/initializing.cc b/initializing.cc
index e6d68b4f..8d1d4a81 100644
--- a/initializing.cc
+++ b/initializing.cc
@@ -8,6 +8,7 @@
 #if defined( Q_OS_WIN32 )
 #include <qt_windows.h>
 #include <uxtheme.h>
+#include <QOperatingSystemVersion>
 
 WindowsStyle::WindowsStyle()
 {
@@ -41,8 +42,7 @@ Initializing::Initializing( QWidget * parent, bool showOnStartup ): QDialog( par
 
   oldBarStyle = 0;
 
-  if( QSysInfo::windowsVersion() >= QSysInfo::WV_VISTA
-      && ( QSysInfo::windowsVersion() & QSysInfo::WV_NT_based )
+  if( QOperatingSystemVersion::current () >= QOperatingSystemVersion::Windows7
       && !IsThemeActive() )
   {
     QStyle * barStyle = WindowsStyle::instance().getStyle();
diff --git a/mainwindow.cc b/mainwindow.cc
index d5bceb30..0e934436 100644
--- a/mainwindow.cc
+++ b/mainwindow.cc
@@ -742,7 +742,7 @@ MainWindow::MainWindow( Config::Class & cfg_ ):
 #ifdef Q_OS_WIN
   if( cfg.normalMainWindowGeometry.width() <= 0 )
   {
-    QRect r = QApplication::desktop()->availableGeometry();
+    QRect r = QGuiApplication::primaryScreen ()->geometry ();
     cfg.normalMainWindowGeometry.setRect( r.width() / 4, r.height() / 4, r.width() / 2, r.height() / 2 );
   }
   if( cfg.maximizedMainWindowGeometry.width() > 0 )