This happened to me when i had two drives in my system and only got Windows Installer to format one.
If you have two drives, you will need to create another partition on the one, and that will allow you to format and install Windows.
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This poetic animation about monsters is illustrated in a Van Gogh painterly style
How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.