sorry cant really help you there... but here is a few things to check:
1. the login ID is "admin" (without the quotes) not administrator, many of my microsnot friends have that problem at first.
2. "admin" is for the web baised manager, "root" is for logging in to the console. ("admin" is also used as the ID for the lynx browser locally)
3. be sure caps lock is OFF and watch hitting the shift key an capping the first letter, I have that problem sometimes when my fingers are doing the typing, not my brain.
4. If you have already gotten into the manager once and changed the password both "admin" and "root" account's passwords will be whatever you changed it to.
Failing that, I would probably have to say dump and reload, unless anyone else knows how to fix it.