--- boost_1_57_0/libs/thread/src/win32/thread.cpp.orig	2014-11-07 15:38:02.024756700 -0500
+++ boost_1_57_0/libs/thread/src/win32/thread.cpp	2014-11-07 15:59:35.564756700 -0500
@@ -533,7 +533,8 @@ namespace boost
         return hardware_concurrency();
 #else
         unsigned cores = 0;
-#if !(defined(__MINGW32__) || defined (__MINGW64__))
+#if !(defined(__MINGW32__) || defined (__MINGW64__)) && _WIN32_WINNT >= 0x0600
+	// This part of code is only available reliably on Windows Vista and Higher
         DWORD size = 0;
 
         GetLogicalProcessorInformation(NULL, &size);
@@ -550,6 +551,7 @@ namespace boost
             if (buffer[i].Relationship == RelationProcessorCore)
                 ++cores;
         }
+#else
 #endif
         return cores;
 #endif