I'm planning on buying the 'Bitdefender Antivirus Plus 2012, 3 PCs, 1 Year' product and have 3 pc's which anti viruses expire on different days. When installing will I be able to install it on each of my 3 pc's when each ones previous antivirus ends? For instance if I have one expiring tomorrow but another with 200 days of Norton still on it and I want to get my use out of the 200 days can I install one count tomorrow and another in a few months without losing time? Thanks 