diff --git a/mk/windoze/Installer/MegaGlestInstaller.nsi b/mk/windoze/Installer/MegaGlestInstaller.nsi
index dcb939a1..c4d02de8 100644
--- a/mk/windoze/Installer/MegaGlestInstaller.nsi
+++ b/mk/windoze/Installer/MegaGlestInstaller.nsi
@@ -101,11 +101,14 @@ FunctionEnd
 
 Function .onInstSuccess
 
-    MessageBox MB_OK "${APNAME} v${APVER} installed successfully, click OK to launch game."
+    MessageBox MB_YESNO "${APNAME} v${APVER} installed successfully, \
+    click Yes to launch the game$\nor 'No' to exit." IDNO noLaunch
 
     SetOutPath $INSTDIR
     Exec 'glest_game.exe'
 
+noLaunch:
+
 FunctionEnd
 
 ; The stuff to install