Hello.I have some questions about the Registration key.The 1 registration key can be used on one computer(even if i have 2 OS installed on it for example) or is used by the OS(if i have 2 Operating Systems installed i have 2 use 2 license keys)? The next question: How can i verify the number of license i have left(i recently bought Bitdefender Total Security 2013 for up to 3 computers for 1 year)? And the last one: If i update my OS (from Win7 to Win8 for example) i have to use another license key or i can use the same as before upgrading? Thanks in advance.