...that you are "pasting" into, that is the problem. Notepad supports text only. To save an image, you need a application that supports images like MS-Paint. If you are getting no result pasting a copied image into Paint then the copy process must be the problem.
I'm using a HP ProBook Laptop. For me to access the <prt sc> button, I need to hold down the <fn> key near the lower left of the keyboard. Therefore, on my ProBook, I hold down the <alt> <fn> and then press the <prt sc> key momentarily. Then I <ctrl> <v> in MS-Paint and an image is visible. I can then save the image.
<ctrl> <fn> <prt sc> captures my whole desktop.
<alt> <fn> <prt sc> captures only the foreground window.
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Full sized keyboards don't require the <fn> key to access the 'print screen' function but many laptops do.
Hope this helps. 
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