I don't use Blender but did come across this (see note below*) - http/blenderartists.org/forum/showthread.php?297873-Blender-will-not-start-missing-ordinal-261-in-swscale-2-dll - in a Blender forum.
*"Some other unfriendly application must've written its version of swscale-2.dll into your library search path. The easiest way is to delete all versions of swscale-2.dll on your system, then reinstall blender. If some other applications ends up complaining about it then, reinstall that program. If the error re-occurs with Blender, then that program was the unfriendly one. Write a furious email to the authors of this program, telling them how incompetent they are. "