In order to disable the calculator, please follow the guideline
Disable Calculator Key on Keyboard
1) Download SharpKeys, Install SharpKeys on Your Computer.
2) After the installation, Launch SharpKeys, it will come with a warning of writing a key to the registry, Click on OK.
3) The SharpKeys Window will open
4) Below, Click on Add.
5) Select the Calculator Key (From Map this Key Table) and To this Key, You Select Turn Key Off (00_00) inorder to disable the key, this Click ok OR Click on Type Key and Press the Calculator Key For Map from this Table and then select Turn Key Off (00_00) inorder to disable the key.
6)Then Below on the right hand corner, Click on Write to Registry (Where the Orange Box is)
https://latestsolution.com/disable-or-remap-calculator-key-on-your-keyboard/