Windows Logon

During WindowsME install, I entered a blank password. How do I undo this. Problem is now I want to be prompted by Family Logon but WinME loads completly without a logon prompt. Windows Logon and Microsoft Networking don’t prompt for a user either. I have tried uninstalling all networking components and the NIC and reinstalling everything in various orders. TWEEKUI does not help either. I must use Start>Log Off to get a prompt. Thanks.