I'm running XP32, no UAC.
Edit:
You installed both http://sourceforge.net/projects/niftools/files/nifskope/1.0.21/nifskope-1.0.21.4886-windows.exe/download and the http://sourceforge.net/projects/niftools/files/niflib/0.7.2/niflib-0.7.2-dll.zip/download thingy?
I have that archive on my computer, but there is no documentation on where to extract the files. Where do they go. I tried before I posted to put them in my nifskope folder, but that did not work either. If you know where they should go specifically, I will try again. But I'm not sure they are needed for what I do.
EDIT: Well, I tried every conceivable combination of the three files in that archive and got the same results. I am clueless as to what else to try, other than extracting every single texture from the BSAs