In your case, you may be trying to use your Display Name (Sanserif.1608) rather than your Account Name (email address associated with your Game Account) to log into the game.
Welcome to Tyria, and good luck.
AHA! That worked. Simple fix. Thanks!
Showing Posts For Sanserif.1608:
Having the same issue. I just downloaded the files, registered the account, and when i click the desktop icon and go to log in, it keeps saying my account name and/or password is invalid. Would i need to check out that page as well? I have gotten the email from arenanet.