Close and reopen IE and engine during intallation

src/engine/Main.cpp

Index: src/engine/Main.cpp
===================================================================
--- a/src/engine/Main.cpp
+++ b/src/engine/Main.cpp
@@ -378,6 +378,42 @@
   return filterEngine;
 }
 
+LRESULT CALLBACK NotificationWindowThread(HWND window, UINT message,
+                                      WPARAM wParam, LPARAM lParam)
+{
+  switch (message)
+  {
+  case WM_CLOSE:
+    // Make sure that all our C streams will be flushed and closed correctly (no corrupt files)
+    exit(0);
+    break;
+  }
+  return DefWindowProc(window, message, wParam, lParam);
+}
+
+
+DWORD WINAPI NotificationWindowStart(void*)
+{
+  const std::wstring windowClassName = L"ABP_NOTIFICATION_WINDOW";
+  WNDCLASSEXW windowClass = {};
+  windowClass.cbSize = sizeof(windowClass);
+  windowClass.lpfnWndProc = NotificationWindowThread;
+  windowClass.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_MENU + 1);
+  windowClass.lpszClassName = windowClassName.c_str();
+  windowClass.hInstance = GetModuleHandle(NULL);
+  RegisterClassEx(&windowClass);
+
+  CreateWindowExW(WS_EX_TOPMOST, windowClassName.c_str(), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
+
+  // Main message loop:
+  MSG msg;
+  while (GetMessage(&msg, NULL, 0, 0))
+  {
+      TranslateMessage(&msg);
+      DispatchMessage(&msg);
+  }
+  return (int)msg.wParam;
+}
 int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
 {
   AutoHandle mutex(CreateMutexW(0, false, L"AdblockPlusEngine"));
@@ -401,6 +437,7 @@
   filterEngine = CreateFilterEngine(locale);
   updater.reset(new Updater(filterEngine->GetJsEngine()));
 
+  CreateThread(NULL, NULL, &NotificationWindowStart, NULL, NULL, NULL);
   for (;;)
   {
     try