Can't open Windows 10 - stuck on spinning device

I had a similar problem. Parallels would start but Windows would be stuck at the spinning wheel, which happened for days (I'd leave it running in the background all day but it still wouldn't boot). I have just been able to get Windows to start by going to Actions-->Reset. I ignored the warning message and canceled disk checking (Windows prompted me to press any key if I wanted to cancel disk checking), Windows went on to install a few updates, and my VM booted up okay. It's now running smoothly.
When I go to actions, all the options are greyed out except 'Start', while the Windows 10 "Checking the disks..." message has been sat there with the spinning wheel for the last 5 or more hours.
 
When I click on the paraellels icon, Windows starts to launch but then all I get is a black screen. Please help. I've tried uninstalling Parallels and reinstalling. Nothing works.
 
Can I ask for instructions on how to fix the Windows 10 failure not installed on my Mac? Do I have to create a support ticket.
 
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Please try the following and let us know how it works:
  1. Paste the command below into Terminal as is (do not hit Enter yet):

    prl_disk_tool check --hdd

  2. Find your virtual machine in Finder. Right-click on the .pvm file of your virtual machine and choose Show Package Contents
  3. Drag your WindowsXXX.hdd file into Terminal and drop it right next to prl_disk_tool check --hdd.
    So as result you will see something like this in Terminal window:

    prl_disk_tool check --hdd /Users/appleseed/Documents/Parallels/Windows\ 7.pvm/Windows\ 7-0.hdd

    Please note there should be a space between --hdd and /Users/....
  4. Press return and wait till this operation completes.
    Operation progress 100%
how long does this take. I have started about 10 minutes ago, still shows 0%
 
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