I know several people have had this problem, and it has died down a bit, but I do have a link to a forum with the way to fix that problem, and it works everytime.

Sorry if this has been posted before, but here is the link:

http://thehelper.net/forums/showthread.php?t=9213

It fixes the CD-Key problem everytime.
Like I said, I know this issue is old, and not many people get it, but if you do, check out that link.