I'm lost, Henry!
Firstly, it's not at all clear to me what you mean when you say that you're trying to 'reset your laptop'. What, exactly, is that you're trying to do?
Further, the only 'security key' that I know of in relation to computers is the wi-fi one, which doesn't come into play at all with most 'resetting' operations that I can think of. (If that is what you're referring to though, you shouldn't need to use it anyway with most modern routers. You simply get your laptop to look for the router and then press the 'WPS' button on the router).