I think the Blender Portable page needs to be updated. https://portableapps.com/apps/graphics_pictures/blender_portable
Heard that Blender had dropped XP, didn't remember any mention here at PAc. So checked, and see:
Support for Windows XP and the SCons build system was removed.
(Note: These requirements are valid for the upcoming Blender 2.77 and the Buildbot. Blender 2.76 still supports Windows XP and OpenGL 1.4 graphics cards.)