I can't open windows 8.1

When I double click on parallels desktop 11 ,The screen windows 8,1 opens and the screen is black.
I'm not able to open nothing. the screen stars black.
I don't know if its a reason, or can help to give me an advice for my problem.
On the top of the screen at left side ,when I double click : it's write " ctrl + alt to liberté of cursor.
I can say also that I began to have that problem with parallels desktop 10.
Because that problem I have decided to buy the parallels desktop 11.the last week end
But it's have not resolve the problem.
My computer is I Mac and run with OSX Yosemite 10.10.5

 

Hello MartinB4,
Kindly select Actions(on Apple Menu Bar) > Reset .
Let us know if it makes any changes.

 

Hello Pradeep@parallels
Yes , i did the reset and it works anew
Thank you very much for your kindly help

 

Sound's great! Feel free to reach out anytime, we are here to help.