I deleted the J: drive, and that has now become unallocated space (158.63 GB) which is what I expected.
I deleted the G: drive and it became Free Space, not unallocated. Either way I can't extend the W7 (I: )drive, so I reformatted it (The G drive) and it is now New Volume G: again. Unless I can make it unallocated I cant extend into it can I
Think I need the aspirin now