You didn't say what OS your using...for win98
1. If user profiles are setup, if not disregard this step: In the Users Control Panel (Start;Settings; Control Panel; Users) delete all users.
2. (Start,Settings,Control Panel,Network) under Primary Network Logon select Microsoft Family Logon.
3. In the Passwords control panel click the User Profiles tab and verify that the 'All users of this PC use the same preferences and desktop settings' option is selected, and then click OK.
4. Click on Start; Find (or Search); Files or Folders.
5. In 'Search for files or folders named' (or Named) box: type in '*.pwl', without the quotation marks.
6. In the 'Look In' box use the drop-down arrow to ensure [C:] is selected.
7. Place a check mark by Include subfolders.
8. Click on "Find (or Search) Now'.
9. Right-click delete all the PWL files found.
10. Close the Find/Search utility and restart the computer via the Start button.
11. When you see the Windows Logon Prompt again, type in a name (preferrably Ima Nonymous) but do not type in a password and click on 'OK'.
Frank's Reg. Hack
How To Prevent Log-In Box From Appearing During Startup
This will work with Windows 98SE and Windows ME:
1. Click Start - Run, type in REGEDIT, then click OK. This will open the registry editor.
2. Click the + in HKEY_LOCAL_MACHINE - Software - Microsoft - Windows - CurrentVersion - Network.
3. In the Network sub-menu, click directly on Real Mode Net to expose its entries in the right pane.
4. If you see AutoLogon listed, right-click it, then click Modify.
5. Change the value from whatever it is to 00 00 00 00 (all zeros), then click OK.
6. If AutoLogon is not present, right-click an empty space in the right pane, then click New - Binary Value.
7. Type in AutoLogon (exactly as you see it here), then press the Enter key to lock in the name.
8. Do steps #4 and #5.
9. Close the registry editor, then reboot.
The password log-in box should no longer appear.