Parallells stuck on black screen after windows update

Ive updated the windows updates and did a restart but it just sits at the spinning circle with a black screen its been there for about a day doing that, So I deleted and reinstalled parallels but still have the same problem.

 

I had the same problem today, presumable from a Windows update. Restarting Windows or even restarting my MacBook Pro would just cause the black screen and spinning circle to resume upon startup. I found a solution elsewhere on this Community message board - Hold down the 'Option' key and use the Parallels pulldown menu to go to Parallels > Actions > Stop. That fixed it immediately for me.

Good luck!