I just bought WoW today, and I made my account. Then I tried to log in, but the game said I entered invalid information, so I tried a few more times. The game kept saying the information was wrong, so I went to the site and got myself a new password.
I can use this new password to log into the website, but in the game it keeps saying I entered invalid information when I try to log in

Are you using the right client for your account? (ie. North America, Europe, Asia) Unlike previous Blizzard games you need a different version for each, and a matching account.

yes, I'm using europe and I registered at www.wow-europe.com

Try WoW-Europe's Tech support forum. May also be useful to copy and paste the entire error message into the post.

Everything works now, thanks a lot