As far as I know software activations that are based off of a limited count are not stored locally in your PC but in the seller's database. As such, you might want to contact the product support of the seller for their tied-up policies.
If you are not too picky with wanting a boxed copy, in the future you might want to look at digital copy sellers as they often sell the same software at a much lower price. For KBAP, below is a link to Gamer's Gate product link:
http://www.gamersgate.com/DD-KBAP/ki...mored-princess
When you buy from them, they give you a product key that has a limited number of activations. But if you happen to use up all of them you could email Gamer's gate support and they will update your account with them with a new product key, effectively resetting your activations count.
I could personally vouch for this as they gave me a new product key when I used up all my activations for KBAP (reformatted my old laptop thrice due to techincal issues, bought a new laptop but had to return it, got a new replacement laptop and reformatted it once from a 32-bit Win 7 OS to a 64-bit one).