I just got a copy of Diablo 3 but am unable to log in to the US servers on my notebook.
The weird thing is that I am unable to log in to my account on my brother's PC as well, while he is able to.
There was a problem with an authentication module. (Error 14404)
He tried deleting the cache on his PC but that gave his account the same error as above, then promptly restored it from the recycle bin.
I have also tried creating 1 character each on the EU and Asia servers.
Any ideas? =/