A friend wasn't aware of keyboard shortcuts and so didn't know he had to use Alt+V to paste in a thread here. I gave him the three basics (Ctrl+C - Copy / Ctrl+V - Paste / Ctrl+X - Cut) and have emailed him this:
Win10 keyboard shortcuts are here: http://windows.microsoft.com/en-us/windows-10/keyboard-shortcuts
Here's a set of less-used ones: http://www.hongkiat.com/blog/100-keyboard-shortcuts-windows/
And here's the original list: https://support.microsoft.com/en-us/kb/126449
Hoping this helps someone.
[Thank you brian aka britechguy on bleeping computer.]