Q:

disable all keyboard shortcuts in windows

I want to disable all keyboard shortcuts in windows, not only the WIN-X ones, but also the CTRL-X ones.
I have found a way to disable the WIN-X ones, by using the registry editor and navigating to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Exlporer and adding a key NoWinKeys and setting it to 0. However, I haven't yet found something like that for the CTRL-X shortcuts.
I want to do this without using any third party tools, preferably using Group Policy or the registry.

A:

For disabling any physical key on the keyboard is a registry entry too.
It's in [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
You create a key with the name Scancode Map. It can redirect any key to another key or disable it.
That key is a hex-value with the following meaning:
00,00,00,00 Header: Version. Set to all zeroes.
00,00,00,00 Header: Flags. Set to all zeroes.
03,00,00,00 3 entries in the map (including null entry).
00,00,xx,yy key xx xx -> Disable (0x00) but can also be another key
00,00,xx,xx key yy yy -> Disable (0x00).
00,00,00,00 Null entry.

To completely disable the CTRL you only need two entries (plus null).
The Left Left-CTRL (1d 00) and Right-CTRL (1d e0).
So you can create a .reg file like this: Disable_CTRL-key.reg
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
"Scancode Map"=hex:00,00,00,00,00,00,00,00,03,00,00,00,00,00,1d,00,00,00,1d,e0,00,00,00,00

Execute (double click) the .reg file and log out and back in (or restart your computer). Now your CTRL-keys are completely disabled.
Other useful keys to know:
1d 00    Left Ctrl
1d e0    Right Ctrl
38 00    Left Alt
38 e0    Right Alt
5b e0    Left Windows Key
5c e0    Right Windows Key
5d e0    Windows Menu Key

If you are not comfortable with changing the registry or you want other keys too you can use the program SharpKeys to edit them more easily. It also has a convenient list of all keys so you can just add them in a window.

