diff --git a/LEGO1/mxcriticalsection.cpp b/LEGO1/mxcriticalsection.cpp
new file mode 100644
index 00000000..9b25c8f9
--- /dev/null
+++ b/LEGO1/mxcriticalsection.cpp
@@ -0,0 +1,73 @@
+#include "mxcriticalsection.h"
+
+#include <stdio.h>
+
+int g_useMutex = 0;
+
+MxCriticalSection::MxCriticalSection()
+{
+  HANDLE mutex;
+
+  if (g_useMutex != 0)
+  {
+    mutex = CreateMutexA(NULL, FALSE, NULL);
+    this->m_mutex = mutex;
+    return;
+  }
+
+  InitializeCriticalSection(&this->m_criticalSection);
+  this->m_mutex = NULL;
+}
+
+MxCriticalSection::~MxCriticalSection()
+{
+  if (this->m_mutex != NULL)
+  {
+    CloseHandle(this->m_mutex);
+    return;
+  }
+
+  DeleteCriticalSection(&this->m_criticalSection);
+}
+
+void MxCriticalSection::SetDoMutex()
+{
+  g_useMutex = 1;
+}
+
+void MxCriticalSection::Enter()
+{
+  DWORD result;
+  FILE *file;
+
+  if (this->m_mutex != NULL)
+  {
+    result = WaitForSingleObject(this->m_mutex, 5000);
+    if (result == WAIT_FAILED)
+    {
+      file = fopen("C:\\DEADLOCK.TXT", "a");
+      if (file != NULL)
+      {
+        fprintf(file, "mutex timeout occurred!\n");
+        fclose(file);
+      }
+
+      abort();
+    }
+  }
+  else
+  {
+    EnterCriticalSection(&this->m_criticalSection);
+  }
+}
+
+void MxCriticalSection::Leave()
+{
+  if (this->m_mutex != NULL)
+  {
+    ReleaseMutex(this->m_mutex);
+    return;
+  }
+
+  LeaveCriticalSection(&this->m_criticalSection);
+}
\ No newline at end of file
diff --git a/LEGO1/mxcriticalsection.h b/LEGO1/mxcriticalsection.h
index 3e9e411c..4c8d43d0 100644
--- a/LEGO1/mxcriticalsection.h
+++ b/LEGO1/mxcriticalsection.h
@@ -1,12 +1,20 @@
-#ifndef MXCRITICALSECTION_H
-#define MXCRITICALSECTION_H
-
-class MxCriticalSection
-{
-public:
-  __declspec(dllexport) MxCriticalSection();
-  __declspec(dllexport) ~MxCriticalSection();
-  __declspec(dllexport) static void SetDoMutex();
-};
-
-#endif // MXCRITICALSECTION_H
+#ifndef MXCRITICALSECTION_H
+#define MXCRITICALSECTION_H
+
+#include <Windows.h>
+
+class MxCriticalSection
+{
+public:
+  __declspec(dllexport) MxCriticalSection();
+  __declspec(dllexport) ~MxCriticalSection();
+  __declspec(dllexport) static void SetDoMutex();
+  void Enter();
+  void Leave();
+
+private:
+  CRITICAL_SECTION m_criticalSection;
+  HANDLE m_mutex;
+};
+
+#endif // MXCRITICALSECTION_H
diff --git a/isle.mak b/isle.mak
index d98109dc..0dd74a84 100644
--- a/isle.mak
+++ b/isle.mak
@@ -57,6 +57,7 @@ CLEAN :
 	-@erase "$(INTDIR)\dllmain.obj"
 	-@erase "$(INTDIR)\legoomni.obj"
 	-@erase "$(INTDIR)\mxcore.obj"
+	-@erase "$(INTDIR)\mxcriticalsection.obj"
 	-@erase ".\Release\LEGO1.DLL"
 	-@erase ".\Release\LEGO1.EXP"
 	-@erase ".\Release\LEGO1.LIB"
@@ -116,7 +117,8 @@ LINK32_FLAGS=kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib\
 LINK32_OBJS= \
 	"$(INTDIR)\dllmain.obj" \
 	"$(INTDIR)\legoomni.obj" \
-	"$(INTDIR)\mxcore.obj"
+	"$(INTDIR)\mxcore.obj" \
+	"$(INTDIR)\mxcriticalsection.obj"
 
 ".\Release\LEGO1.DLL" : "$(OUTDIR)" $(DEF_FILE) $(LINK32_OBJS)
     $(LINK32) @<<
@@ -144,6 +146,7 @@ CLEAN :
 	-@erase "$(INTDIR)\dllmain.obj"
 	-@erase "$(INTDIR)\legoomni.obj"
 	-@erase "$(INTDIR)\mxcore.obj"
+	-@erase "$(INTDIR)\mxcriticalsection.obj"
 	-@erase "$(INTDIR)\vc40.idb"
 	-@erase "$(INTDIR)\vc40.pdb"
 	-@erase "$(OUTDIR)\LEGO1.exp"
@@ -207,7 +210,8 @@ LINK32_FLAGS=kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib\
 LINK32_OBJS= \
 	"$(INTDIR)\dllmain.obj" \
 	"$(INTDIR)\legoomni.obj" \
-	"$(INTDIR)\mxcore.obj"
+	"$(INTDIR)\mxcore.obj" \
+	"$(INTDIR)\mxcriticalsection.obj"
 
 ".\Debug\LEGO1.DLL" : "$(OUTDIR)" $(DEF_FILE) $(LINK32_OBJS)
     $(LINK32) @<<
@@ -477,6 +481,19 @@ DEP_CPP_LEGOO=\
    $(CPP) $(CPP_PROJ) $(SOURCE)
 
 
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\LEGO1\mxcriticalsection.cpp
+DEP_CPP_MXCRI=\
+	".\LEGO1\mxcriticalsection.h"\
+	
+
+"$(INTDIR)\mxcriticalsection.obj" : $(SOURCE) $(DEP_CPP_MXCRI) "$(INTDIR)"
+   $(CPP) $(CPP_PROJ) $(SOURCE)
+
+
 # End Source File
 # End Target
 ################################################################################
diff --git a/isle.mdp b/isle.mdp
index 61c43766..9b671ec0 100644
Binary files a/isle.mdp and b/isle.mdp differ