Computer Registration Issues

I am trying to register a computer. I keep getting an error that says Please Try again. The email address or password you provided is not correct. Everywhere i look says I must have typed in the wrong user and pass so i took the user and password and pasted it into a text document. Instead of typing it copied and pasted it into the login and i was denied again but when i copied and pasted it into the website login it worked.  I have already tried changing my password and that didn't work. I'm not sure what is going on? Anyone have any Ideas?