You're new at this posting thing, I take it? That's not much information. O_o

Only thing I can think of that tends to trigger errors beyond PEBKAC at this stage is if you tried to open more than three trial accounts from the same IP address. Is that what you did?

If it's PEBKAC, that's fine too, you're new. But I need more info about what you were doing to make sense of it since I'm not privy to Blizzard's internal error codes.