diff --git a/reactos/dll/directx/ddraw/Ddraw/ddraw_displaymode.c b/reactos/dll/directx/ddraw/Ddraw/ddraw_displaymode.c
index 4514826e46c..cd73d6e38c6 100644
--- a/reactos/dll/directx/ddraw/Ddraw/ddraw_displaymode.c
+++ b/reactos/dll/directx/ddraw/Ddraw/ddraw_displaymode.c
@@ -107,56 +107,72 @@ Main_DirectDraw_SetDisplayMode (LPDIRECTDRAW7 iface, DWORD dwWidth, DWORD dwHeig
     LPDDRAWI_DIRECTDRAW_INT This = (LPDDRAWI_DIRECTDRAW_INT)iface;
     DX_WINDBG_trace();
 
-    // FIXME: Check primary if surface is locked / busy etc.
+    HRESULT ret = DD_OK;
 
-    // Check Parameters
-    if(dwFlags != 0)
+    _SEH_TRY
     {
-        return DDERR_INVALIDPARAMS;
-    }
+        // FIXME: Check primary if surface is locked / busy etc.
 
-    if ((!dwHeight || This->lpLcl->lpGbl->vmiData.dwDisplayHeight == dwHeight) && 
-        (!dwWidth || This->lpLcl->lpGbl->vmiData.dwDisplayWidth == dwWidth)  && 
-        (!dwBPP || This->lpLcl->lpGbl->vmiData.ddpfDisplay.dwRGBBitCount == dwBPP) &&
-        (!dwRefreshRate || This->lpLcl->lpGbl->dwMonitorFrequency == dwRefreshRate))  
+        // Check Parameters
+        if(dwFlags != 0)
+        {
+            ret = DDERR_INVALIDPARAMS;
+        }
+        else
+        {
+            if ((!dwHeight || This->lpLcl->lpGbl->vmiData.dwDisplayHeight == dwHeight) && 
+                (!dwWidth || This->lpLcl->lpGbl->vmiData.dwDisplayWidth == dwWidth)  && 
+                (!dwBPP || This->lpLcl->lpGbl->vmiData.ddpfDisplay.dwRGBBitCount == dwBPP) &&
+                (!dwRefreshRate || This->lpLcl->lpGbl->dwMonitorFrequency == dwRefreshRate))  
+            {
+                ret = DD_OK; // nothing to do here for us
+            }
+            else
+            {
+                // Here we go
+                DEVMODE DevMode;
+                DevMode.dmFields = 0;
+
+                if (dwHeight) 
+                    DevMode.dmFields |= DM_PELSHEIGHT;
+                if (dwWidth) 
+                    DevMode.dmFields |= DM_PELSWIDTH;
+                if (dwBPP) 
+                    DevMode.dmFields |= DM_BITSPERPEL;
+                if (dwRefreshRate) 
+                    DevMode.dmFields |= DM_DISPLAYFREQUENCY;
+
+                DevMode.dmPelsHeight = dwHeight;
+                DevMode.dmPelsWidth = dwWidth;
+                DevMode.dmBitsPerPel = dwBPP;
+                DevMode.dmDisplayFrequency = dwRefreshRate;
+
+                LONG retval = ChangeDisplaySettings(&DevMode, CDS_FULLSCREEN); /* FIXME: Are we supposed to set CDS_SET_PRIMARY as well ? */
+
+                if(retval == DISP_CHANGE_BADMODE)
+                {
+                    ret = DDERR_UNSUPPORTED;
+                }
+                else if(retval != DISP_CHANGE_SUCCESSFUL)
+                {
+                    ret = DDERR_GENERIC;
+                }
+                else
+                {
+                    // Update Interals
+                    BOOL ModeChanged;
+                    DdReenableDirectDrawObject(This->lpLcl->lpGbl, &ModeChanged);
+                    StartDirectDraw((LPDIRECTDRAW)iface, 0, TRUE);
+                }
+            }
+        }
+    }
+    _SEH_HANDLE
     {
-        return DD_OK; // nothing to do here for us
     }
+    _SEH_END;
 
-    // Here we go
-    DEVMODE DevMode;
-    DevMode.dmFields = 0;
-    if(dwHeight) 
-        DevMode.dmFields |= DM_PELSHEIGHT;
-    if(dwWidth) 
-        DevMode.dmFields |= DM_PELSWIDTH;
-    if(dwBPP) 
-        DevMode.dmFields |= DM_BITSPERPEL;
-    if(dwRefreshRate) 
-        DevMode.dmFields |= DM_DISPLAYFREQUENCY;
-
-    DevMode.dmPelsHeight = dwHeight;
-    DevMode.dmPelsWidth = dwWidth;
-    DevMode.dmBitsPerPel = dwBPP;
-    DevMode.dmDisplayFrequency = dwRefreshRate;
-
-    LONG retval = ChangeDisplaySettings(&DevMode, CDS_FULLSCREEN); /* FIXME: Are we supposed to set CDS_SET_PRIMARY as well ? */
-
-    if(retval == DISP_CHANGE_BADMODE)
-    {
-        return DDERR_UNSUPPORTED;
-    }
-    else if(retval != DISP_CHANGE_SUCCESSFUL)
-    {
-        return DDERR_GENERIC;
-    }
-
-    // Update Interals
-    BOOL ModeChanged;
-    DdReenableDirectDrawObject(This->lpLcl->lpGbl, &ModeChanged);
-    StartDirectDraw((LPDIRECTDRAW)iface, 0, TRUE);
-
-    return DD_OK;
+    return ret;
 }
 
 HRESULT WINAPI
@@ -165,12 +181,20 @@ Main_DirectDraw_RestoreDisplayMode (LPDIRECTDRAW7 iface)
     LPDDRAWI_DIRECTDRAW_INT This = (LPDDRAWI_DIRECTDRAW_INT)iface;
     DX_WINDBG_trace();
 
-    ChangeDisplaySettings(NULL, 0);
+    _SEH_TRY
+    {
+        ChangeDisplaySettings(NULL, 0);
+
+        // Update Interals
+        BOOL ModeChanged;
+        DdReenableDirectDrawObject(This->lpLcl->lpGbl, &ModeChanged);
+        StartDirectDraw((LPDIRECTDRAW)iface, 0, TRUE);
+    }
+    _SEH_HANDLE
+    {
+    }
+    _SEH_END;
 
-    // Update Interals
-    BOOL ModeChanged;
-    DdReenableDirectDrawObject(This->lpLcl->lpGbl, &ModeChanged);
-    StartDirectDraw((LPDIRECTDRAW)iface, 0, TRUE);
 
     return DD_OK;
 }
@@ -178,37 +202,62 @@ Main_DirectDraw_RestoreDisplayMode (LPDIRECTDRAW7 iface)
 HRESULT WINAPI
 Main_DirectDraw_GetMonitorFrequency (LPDIRECTDRAW7 iface, LPDWORD lpFreq)
 {
+    HRESULT retVal = DD_OK;
     LPDDRAWI_DIRECTDRAW_INT This = (LPDDRAWI_DIRECTDRAW_INT)iface;
     DX_WINDBG_trace();
 
-    if (lpFreq == NULL)
-        return DDERR_INVALIDPARAMS;
+    _SEH_TRY
+    {
+        if(IsBadWritePtr(lpFreq,sizeof(LPDWORD)))
+        {
+            retVal = DDERR_INVALIDPARAMS;
+        }
+        else
+        {
+            *lpFreq = This->lpLcl->lpGbl->dwMonitorFrequency;
+        }
+    }
+    _SEH_HANDLE
+    {
+    }
+    _SEH_END;
 
-    *lpFreq = This->lpLcl->lpGbl->dwMonitorFrequency;
-
-    return DD_OK;
+    return retVal;
 }
 
 HRESULT WINAPI
 Main_DirectDraw_GetDisplayMode (LPDIRECTDRAW7 iface, LPDDSURFACEDESC2 pDDSD)
 {
+    HRESULT retVal = DD_OK;
     LPDDRAWI_DIRECTDRAW_INT This = (LPDDRAWI_DIRECTDRAW_INT)iface;
     DX_WINDBG_trace();
 
-    if (pDDSD == NULL)
-        return DDERR_INVALIDPARAMS;
+    _SEH_TRY
+    {
+        if(IsBadWritePtr(pDDSD,sizeof(LPDWORD)))
+        {
+            retVal = DDERR_INVALIDPARAMS;
+        }
+        else if (pDDSD->dwSize != sizeof(DDSURFACEDESC2))
+        {
+             retVal = DDERR_INVALIDPARAMS;
+        }
+        else
+        {
+            // FIXME: More stucture members might need to be filled
 
-    if (pDDSD->dwSize != sizeof(DDSURFACEDESC2))
-        return DDERR_INVALIDPARAMS;
+            pDDSD->dwFlags |= DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT | DDSD_PITCH | DDSD_REFRESHRATE;
+            pDDSD->dwHeight = This->lpLcl->lpGbl->vmiData.dwDisplayHeight;
+            pDDSD->dwWidth = This->lpLcl->lpGbl->vmiData.dwDisplayWidth;
+            pDDSD->ddpfPixelFormat = This->lpLcl->lpGbl->vmiData.ddpfDisplay;
+            pDDSD->dwRefreshRate = This->lpLcl->lpGbl->dwMonitorFrequency;
+            pDDSD->lPitch = This->lpLcl->lpGbl->vmiData.lDisplayPitch;
+        }
+    }
+    _SEH_HANDLE
+    {
+    }
+    _SEH_END;
 
-    // FIXME: More stucture members might need to be filled
-
-    pDDSD->dwFlags |= DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT | DDSD_PITCH | DDSD_REFRESHRATE;
-    pDDSD->dwHeight = This->lpLcl->lpGbl->vmiData.dwDisplayHeight;
-    pDDSD->dwWidth = This->lpLcl->lpGbl->vmiData.dwDisplayWidth;
-    pDDSD->ddpfPixelFormat = This->lpLcl->lpGbl->vmiData.ddpfDisplay;
-    pDDSD->dwRefreshRate = This->lpLcl->lpGbl->dwMonitorFrequency;
-    pDDSD->lPitch = This->lpLcl->lpGbl->vmiData.lDisplayPitch;
-
-    return DD_OK;
+    return retVal;
 }