help please windows 10

hi all I am trying to put win 10 on my Mac Pro 5.1 Sierra using bootcamp all ok until reboot then stuck on window s logo nothing els happens gave up after 2hours any help much appreciated
sorted
I have taken the drive out of bay 1 put a new drive in leaving all other drives in place win 10 installed no problems ever thing working mouse keyboard wifi bleu tooth gpu
? can I control the fans in windows as I can in Sierra any suggestions much appreciated
thanks