Hi Susan...
I know nothing of this sort of thing[or helicopters ] but i do know that an old anti virus must be removed before adding a new one...
This is something I found out when a 'friend' downloaded a New Anti virus protecter before removing the old one which quickly sent my PC into a serious state of safe mode that cost me a lot of money to put right ...
You all probably know this but there might be a few like me out there who dont