Made new account, can't log-in anymore

[Arito]

Hi,

I made a new account today, when I decided I really don't need one (my roommate and I use the same computer). So now, hours later, I restarted the computer and suddenly it prompts me to log-in. I have tried every password that I possibly could have 'registered' with, but none work on the standard "Administrator" account, nor on the new account. Can I work around this or am I doomed to reinstall Windows?

Regards,