The AOL Instant Messenger client shows an Invalid Password error (or another similar error)
See the rest of this article for common causes and their workarounds.
You have a ChivaNet account, but no AIM screen name
In the normal case, ChivaNet will register an AIM screen name with the same credentials as your ChivaNet account. However, if your ChivaNet account credentials do not constitute a valid AIM screen name and password, you will have to create a screen name manually.
Note that your screen name CANNOT begin with a number or a symbol, and must be 16 or fewer characters. Also, keep your password to a reasonably short length.