I use to have Starcraft 2 on my laptop and it couldn't handle it. I have got a new computer, and do not know where I placed my disk, I did register it online and have tried to download the client from online. I get this message, "There was a problem authenticating your download. Please go to http://www.blizzard.com/account/ to start a new download. I have tried this a few times and no luck. Can you help me?