Windows 10 print screen and I need help to fix it. Problem solved.

Problem solved: 

 sijoittaja25  ·  13 minutes ago

Now it is working, I had to make my game windowed mode for taking a screenshot.

I had previous windows 7 and print screen worked back then perfectly. I uppgraded my windows to version 10 few month ago, but now in this version of windows printsreens are only black colored picture. How I can fix this, or is this unfixable problem?

Steps I made when printsreening:

1. Pressed Print Screen button in my keyboard

2. Ctrl + V in Paint

Thanks for your help in advance. 

-Sijoittaja