Maximum PC

was using default account as main, which was made just days ago during a clean reinstall of XP. Decided to give it a name I know i won't forget, restarted computer last night, now it goes to login screen with no visible accounts on screen. do the ctrl+alt+del x2 to get the classic login box, put in my account name (already in the box) click login since I never gave it a password... WRONG! It gives me the wrong username/password pop up. I know i didn't misspell it... it's my name. i never gave it a password