diff --git a/ISLE/main.cpp b/ISLE/main.cpp
index 9ef4466e..89284948 100644
--- a/ISLE/main.cpp
+++ b/ISLE/main.cpp
@@ -19,7 +19,7 @@ BOOL findExistingInstance(void)
 
 BOOL startDirectSound(void)
 {
-  LPDIRECTSOUND lpDS = 0;
+  LPDIRECTSOUND lpDS = NULL;
   HRESULT ret = DirectSoundCreate(NULL, &lpDS, NULL);
   if (ret == DS_OK && lpDS != NULL) {
     lpDS->Release();
@@ -49,7 +49,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
   // Throw error if sound unavailable
   if (!soundReady) {
     MessageBoxA(NULL, "\"LEGO\xAE Island\" is not detecting a DirectSound compatible sound card.  Please quit all other applications and try again.",
-      "Lego Island Error",0);
+      "Lego Island Error", MB_OK | MB_APPLMODAL);
     return 0;
   }
 
@@ -58,7 +58,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 
   // Create window
   if (g_isle->setupWindow(hInstance) != SUCCESS) {
-    MessageBoxA(NULL, "\"LEGO\xAE Island\" failed to start.  Please quit all other applications and try again.", "LEGO\xAE Island Error",0);
+    MessageBoxA(NULL, "\"LEGO\xAE Island\" failed to start.  Please quit all other applications and try again.", "LEGO\xAE Island Error", MB_OK | MB_APPLMODAL);
     return 0;
   }