I've noticed that since I was updated to Windows 10, the "PrtScn" key on my keyboard doesn't work. I've resorted to using an app called Skitch to take screenshots unless I can find another, better, faster, shorter way to capture an image of my screen.
I've had Windows 10 about a month, and am still not necessarily a fan.
Look on the Start Menu. Scroll down to "Snip & Sketch." It's the Windows 10 equivalent of what Windows 7 called the "Snipping Tool." It lets you drag the mouse to create a screenshot and then mark it up if needed.
I can still use Print Screen on my Windows 10 computer.
On both my home computer and my work computer, which both run Windows 10,
PrintScreen works just fine, and
Snipping Tool is still called
Snipping Tool.
However, Windows 10 has been known to cause some issues with certain models of keyboards, especially messing with the functionality of the 10-key number pad. Sir Belkins: you might try
these suggestions.