Problem with importing/exporting meshes with Blender 2.74

[AeroModss]

Yooooo.
So I was surfing over the internet in hope that I might find a tutorial on how to import/export meshes with Blender 2.74 correctly.And I found this web page: http://niftools.sourceforge.net/forum/viewtopic.php?f=13&t=5823 .
I decided to try it out.I installed all plugins.Went to extract meshes.bsa with FO3 Archive so I could try and import something in Blender . And everytime I do it,I get the same problem,and some error pops up,like the whole mesh isn't imported.What should I do ???