I ve successfully installed Bitdefender total security 2012 and everything works fine but am not able to upgrade the pack to 2013 as it keeps forgetting my keys and if i try to enter it says invalid key. i ve tried both the methods but still it does not work. need help 
Hello
Welcome to the forums!
Please send me a PM with the email address that you used to register the My Bitdefender account and you current license key so I can check them in the system.
DO NOT POST THEM ON THE FORUMS!
Thank you!