diff --git a/src/generic/vscroll.cpp b/src/generic/vscroll.cpp
index 1f2c1c16b1..d3eb9a3e5f 100644
--- a/src/generic/vscroll.cpp
+++ b/src/generic/vscroll.cpp
@@ -772,16 +772,20 @@ void wxHVScrolledWindow::SetRowColumnCounts(size_t rowCount, size_t columnCount)
 
     // recalculate the scrollbars parameters
     if(m_rowsFirst >= rowCount)
-        m_rowsFirst = rowCount-1;
+        m_rowsFirst = (rowCount > 0) ? rowCount - 1 : 0;
 
     if(m_columnsFirst >= columnCount)
-        m_columnsFirst = columnCount-1;
+        m_columnsFirst = (columnCount > 0) ? columnCount - 1 : 0;
 
+#if 0
+    // checks disabled due to size_t type of members
+    // but leave them here if anyone would want to do some debugging
     if(m_rowsFirst < 0)
         m_rowsFirst = 0;
 
     if(m_columnsFirst < 0)
         m_columnsFirst = 0;
+#endif
 
     ScrollToRowColumn(m_rowsFirst, m_columnsFirst);
 }
diff --git a/src/msw/mediactrl_am.cpp b/src/msw/mediactrl_am.cpp
index b1529a5483..52644f1bc8 100644
--- a/src/msw/mediactrl_am.cpp
+++ b/src/msw/mediactrl_am.cpp
@@ -2266,4 +2266,4 @@ FORCE_LINK_ME(wxmediabackend_am)
 //---------------------------------------------------------------------------
 //  End wxMediaCtrl Compilation Guard and this file
 //---------------------------------------------------------------------------
-#endif // wxUSE_MEDIACTRL
\ No newline at end of file
+#endif // wxUSE_MEDIACTRL
diff --git a/src/msw/ole/activex.cpp b/src/msw/ole/activex.cpp
index 4b5a415e64..0c8ec070f4 100644
--- a/src/msw/ole/activex.cpp
+++ b/src/msw/ole/activex.cpp
@@ -946,7 +946,7 @@ void wxActiveXContainer::CreateActiveX(REFIID iid, IUnknown* pUnk)
                 hret = cp->Advise(new wxActiveXEvents(this, ta->guid),
                                   &adviseCookie);
                 wxASSERT_MSG( SUCCEEDED(hret),
-                    wxString::Format(wxT("Cannot connect!\nHRESULT:%X"), hret)
+                    wxString::Format(wxT("Cannot connect!\nHRESULT:%X"), (unsigned int)hret)
                             );
             }
         }