How to disable native Windows functions (keys)?

[Scr1pter]

Hi,

I would like to do the following two modifications (Windows 7 Pro 64 Bit):

1) Removing the PrintScreen functionality
My aim is that if I press PrintScreen, nothing will happen.
However,
1. AutoHotkey should still be able to work with PrintScreen::
2. Alt+PrintScreen and Shift+PrintScreen should still be possible (by Windows)

2) Blocking the Alt+Numpad functions
Whenever I press and hold the Alt key and press any Numpad key afterwards, Windows generates some characters.
For me this is only disturbing, besides I will never remember those kombinations.
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Any idea how to block them without using AHK?
I think I did something like that many years ago by modifying the Regedit, but I'm not such a crack anymore

Thanks for any help!

Regards

[SorrymyEN]

Tested in Windows10 64-bit... for

1)
PrintScreen::Return

2)
!Numpad1::return
!Numpad2::return
!Numpad3::return
!Numpad4::return
!Numpad5::return
!Numpad6::return
!Numpad7::return
!Numpad8::return
!Numpad9::return
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If you figure out how to do this via Regedit again, please let me know