I purchase a Bitdefender internet 3 computer key and installed the program on both my computers which was installed correctly on both! I went online and signed up for an account which showed both computers were protected correctly! Four days later when I turned on one computer it said Bitdefender has expired and it shut down but the other computer is working fine. I contacted service but they do not seem to understand the problem so to protect my computer I purchased and installed another brand protection which is working great! I will have to remove the one that is working as I am afraid that this will shut down also! I like the program and this is the first time using Bitdefender so I will watch this if it happens!