Many times we need to remap our keyboard keys, means we need to change the function of keys on our keyboard. You can do this so that no one else can use use your computer as he is not aware of which key perform which function.
Or you might wanna disable any key from your keyboard, suppose you might wanna disable Caps Lock key as you might rarely use it.
For this you can either use registry method in which you can delete or modify the entries but they are risky and might not suit you, so you can use MapKeyboard, an freeware and portable tool for windows.
You can download it via below link and the launch it, it will show a keyboard layout and then select the key to which you wanna disable or remap, once key is selected just select the option and save it.
Once you save it, just log off and login back so that tool can take do its work.