Unable to install Windows 8.1 through Boot Camp

[colourfastt]

I'm trying to reinstall Windows 8.1 on my iMac and get the following error:

The startup disk cannot be partitioned or restored to a single partition.

The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows.

The odd part is that my disk IS a single partition as shown in the attached pics ... any help would be appreciated.

 

[ActionableMango]

I'm very confused. If you are reinstalling Windows, where is your existing Windows partition? You should have been able to reinstall it in the existing Windows partition.

Your boot selector shows a Windows partition, but your diskutil screen shot does not. Were these screen shots taken at different times?

On a different note, why are there two recovery partitions? Is this normal for El Capitan?

 

[colourfastt]

As you can, plainly, see .. there is no Windows partition. The screenshots were taken about 30 seconds apart. The two different recovery partitions I think came about because at one time I was running both 10.10 and 10.11 beta.