hey,,i `m makaing a new types of armor and weapon in blender for oblivion ,but when i try to import some meshes i got error "RuntimeError: Unknow block type encountered during file read: BSXFlags" can you tell me where i made mistake ,,i use Nif Tools 1.5.7 ,Blender 2.43 and Blender_nif_scripts 1.5.7,,,,,,,,,,,,,,,,,,,thx

That's quite an old Blender and a very old version of NifScripts. The current Blender is 2.49 and this NifScripts version is from "2006". The current one is 2.5.02, quite a difference.
I would advise upgrading to more recent versions. The NifScripts not knowing what "BSXFlags" are is highly doubtable.
Also make sure you got all requirements installed properly as well.
Basically you should be safe to download and install the latest versions of everything linked on http://niftools.sourceforge.net/wiki/Blender.
I'd just stick to Python 2 for now. I don't know how well Python 3 is supported already.

now python is problemm ,,,,,,,,,"Python:Script problem" ????? :banghead: