In your data, the resolution matrix is not identical (1,0,0 ; 0,1,0 ; 0,0,1) and I found massive rotations within the header.

I recommand you to carefully rotate T2 images using dedicated function in FSL, AFNI or anatomist to align them onto the template before starting segmentation.

Usually, I use both anatomist and AIMS functions to do that.
For information see:
http://brainvisa.info/web/download.html
http://brainvisa.info/aimsdata-4.5/user_...

I successfully segmented and normalized your T2 image using SPM8. As previously discussed you should increase 10 times the resolution of your data and both priors and template to use SPM for segmentation

I also recommand you to use the brain mask during these processes.

See the batch file in attach.

Best.

David from the SIGMA Team.