diff --git a/source/CPU.cpp b/source/CPU.cpp
index b4f56d96..b071f260 100644
--- a/source/CPU.cpp
+++ b/source/CPU.cpp
@@ -636,6 +636,7 @@ DWORD CpuExecute(const DWORD uCycles, const bool bVideoUpdate)
 // Called by:
 // . CpuInitialize()
 // . SY6522.Reset()
+// . FrameCreateWindow() -> WM_CREATE
 void CpuCreateCriticalSection(void)
 {
 	if (!g_bCritSectionValid)
@@ -648,16 +649,13 @@ void CpuCreateCriticalSection(void)
 //===========================================================================
 
 // Called from RepeatInitialization():
-// 1) FrameCreateWindow() -> WM_CREATE
-//    - done to init g_CriticalSection
-//    - but can't call CpuReset() as mem == NULL
-// 2) MemInitialize() -> MemReset()
-void CpuInitialize(bool reset)
+// . MemInitialize() -> MemReset()
+void CpuInitialize(void)
 {
 	regs.a = regs.x = regs.y = 0xFF;
 	regs.sp = 0x01FF;
-	if (reset)
-		CpuReset();
+
+	CpuReset();
 
 	CpuCreateCriticalSection();
 
@@ -683,6 +681,8 @@ void CpuDestroy()
 
 void CpuReset()
 {
+	_ASSERT(mem != NULL);
+
 	// 7 cycles
 	regs.ps = (regs.ps | AF_INTERRUPT) & ~AF_DECIMAL;
 	regs.pc = *(WORD*)(mem + 0xFFFC);
diff --git a/source/CPU.h b/source/CPU.h
index 96c69eb4..90ee5204 100644
--- a/source/CPU.h
+++ b/source/CPU.h
@@ -33,7 +33,7 @@ void    CpuCalcCycles(ULONG nExecutedCycles);
 DWORD   CpuExecute(const DWORD uCycles, const bool bVideoUpdate);
 ULONG   CpuGetCyclesThisVideoFrame(ULONG nExecutedCycles);
 void    CpuCreateCriticalSection(void);
-void    CpuInitialize(bool reset);
+void    CpuInitialize(void);
 void    CpuSetupBenchmark ();
 void	CpuIrqReset();
 void	CpuIrqAssert(eIRQSRC Device);
diff --git a/source/Memory.cpp b/source/Memory.cpp
index dace7333..83db7f01 100644
--- a/source/Memory.cpp
+++ b/source/Memory.cpp
@@ -1926,7 +1926,7 @@ void MemReset()
 
 	// INITIALIZE & RESET THE CPU
 	// . Do this after ROM has been copied back to mem[], so that PC is correctly init'ed from 6502's reset vector
-	CpuInitialize(true);
+	CpuInitialize();
 	//Sets Caps Lock = false (Pravets 8A/C only)
 
 	z80_reset();	// NB. Also called above in CpuInitialize()
diff --git a/source/Windows/WinFrame.cpp b/source/Windows/WinFrame.cpp
index d63715aa..814a0476 100644
--- a/source/Windows/WinFrame.cpp
+++ b/source/Windows/WinFrame.cpp
@@ -1001,8 +1001,8 @@ LRESULT Win32Frame::WndProc(
 	  DIMouse::DirectInputInit(window);
       LogFileOutput("WM_CREATE: DIMouse::DirectInputInit()\n");
 
-	  CpuInitialize(false);	// NB. Creates CriticalSection that's needed by MB_Initialize()
-	  LogFileOutput("WM_CREATE: CpuInitialize()\n");
+	  CpuCreateCriticalSection();	// NB. Creates CriticalSection that's needed by MB_Initialize() -- required on a VM restart
+	  LogFileOutput("WM_CREATE: CpuCreateCriticalSection()\n");
 
 	  MB_Initialize();
       LogFileOutput("WM_CREATE: MB_Initialize()\n");