Thanks for the help, but unfortunately the splash screen still appears, even after deleting all of my temp files and reinstalling the game. And when I exit from the splash screen the demo version of the game runs. This is the message that appears:

"This key has already been activated on the maximum number of computers. If you believe this is mistaken, please contact customer service at 800-656-5426 and reference code ARM1022."

I've now contacted customer services (support@telltalegames.com) requesting my key, but am wondering if there is anything else I can try to run the game while waiting.

Thanks for the welcome by the way. I'm looking forward to getting past this problem and enjoying this game and its sequel.