I don't understand what my log in is?!

I used to play a few months back and I wanted to come back and play. I installed and whatnot and forget my info. I gave my keys and such to a GM and they told me my account name was let's just say for security purposes "GuildWarsGuru" and so I typed that in and it says it's not valid on the guild wars log in in game. It was sent to my email and I've tried putting that in and it doesn't work. Why does this system have to be so complicated? Anybody care to help me out?

login is your email address. password you should know.

I've typed in all the email addresses that I've ever had and it says they aren't in the game!

ah! I found it. I was thinking it was @plaync.com but there was no .com
thanks

I would try resetting your password on the email that you know you used to log in.