Hi and welcome to TSF!
You should be able to clear the shortcut key by right clicking on the shortcut file and clicking properties. In the 'Shortcut' tab, select the Shortcut Key field and hit backspace. Click apply then OK and you should have cleared the key binding.
You should be able to clear the shortcut key by right clicking on the shortcut file and clicking properties. In the 'Shortcut' tab, select the Shortcut Key field and hit backspace. Click apply then OK and you should have cleared the key binding.