PC Continues To Load Up With No Further Prompt

A friend of mine set up my computer for me, and is no longer available to answer this question, so Here it is: When starting up Windows I get past the black-windows XP screen with windows flag, then on the next screen, when the screen background turns blue, I get a "Enter password" dialog box. I simply hit the Enter with no Password, and the PC continues to load up Windows with no further prompt. The PC is running Windows XP Professional Home Edition, is in a single home use enviornment, and it serves only my wife & I. I see no need to limit file accessibility, therefore no need for any password. Did my friend enter me as an Administrator during the system build? If so, do I have to delete the Administrator and Guest account? I want to 'get-rid' of this password screen - it is more annoying than anything else.