Defraggler gets stuck

Hi, I am running Defraggler for the first time and it has taken about 12 hours to get to 54% defragged but has been stuck on 54% for about the last 5 hours. My OS is Windows Vista, my hard drive 320GB, with around 150GB used.

What have I not done or what could possibly be causing this problem; appreciate any assistance.

I've found similar behaviour and reported in my new topic just now created.

Defraggler Hangs and Loops