Fixes an issue with 64 bit Windows 7 running 32 bit Visual Express C++ 2010
Fixes an issue with 64 bit Windows 7 running 32 bit Visual Express C++ 2010

bug: http://scons.tigris.org/issues/show_bug.cgi?id=2849

andrewyoung1991/scons,andrewyoung1991/scons,andrewyoung1991/scons,andrewyoung1991/scons,andrewyoung1991/scons,andrewyoung1991/scons,andrewyoung1991/scons,andrewyoung1991/scons,andrewyoung1991/scons