I can't log in. HELP!

I know for a fact I am entering the right username and password, but it still won't let me log in. When I request a new password, it tells me that my username or email is invalid. Was my account deleted?
Inactive accounts are "pruned" from the system after several years, or if the account was created but never activated within 6 months. If you like your username and wish to keep it on this site, make sure you log in at least once a year, even if you don't find any reason to. Otherwise you will need to re-register, and put in all of your profile details all over again. You probably do not want to have to do this, so it's best if you keep your registration up to date.