Ubuntu 9.04

[AlfaCharger]

hey,

i'm trying to install ubuntu 9.04, I rebooted my laptop, and it says "YMZ02 Login"

I type in my username and password, but it keeps saying "Login Incorrect"

What should I do?

*Note I have to hit 'enter' for the password slot
**note There was a window dring installation that i changed ubuntu -to- YMZ02.

Thanks!