I bought a new set of 3 licenses for NIS on Amazon. I have three pc's. They had like 48 days left. I figured adding the key would get me 365 more days. I entered the new key on one computer and now it says 365 days remaining, total. So I wasted 48 days. What happens if I go back and enter the old key? Will I get my 48 days back, then it deactivates the new one until I enter it later, or will I lose the 365 days starting now anyway?