I have to reformet my Laptops Hard Drive and I was wondering if my Activation Key would work again. I've also used the other two on my Computer and Netbook.
Hi. You can prolly contact them or submit a ticket with your account info so they could manually reactivate it for you. Don't post your info here.
You made one mistake:
Befor you format your HDD you have to deinstall F-Secure that the Key is free and unused.
So, flooger is right: The only way you have-> contact the support.