@DojoFS Please review scribblemaniac’s reply above in order to solve your issue.
Also if possible for future problems make sure to use the search function and check if your problem has been solved before. Since this particular issue is very common for Windows users (and it’s not really a Pencil2D issue) we have a dedicated pinned topic on this forum with the solution 
If you have any other issues we’ll reply as soon as we’re able 