New install of Beta .651 on Windows 10. Only rebooted once not twice. 
Didn't have a new pool button, just an option to add drives so I clicked on the + Add link for the D: drive, it hung at 95%. When the pool was never created I cancelled the creation, then tried with the E: Drive. This sat at 95%, then it appeared the pool creation canceled on it's own. I have no pool and I cannot add the D: or E: drives as they error out saying they are in the pool already. I found the article that I need to reboot 2x for Windows 10 after I tried creating the pool.
How do I remove the pool that exists but I cannot see and start over?
[Edit] - I have rebooted 2x and no change in behavior.