[list=1]Click on the Start menu and select "Find", then select "Find files and folders".
Type *.pwl in the "Named:" box and hit Enter.
When the PC is done searching, delete all the files ending with pwl.
Close the Find box.
Now, open the Control Panel and click on "Network".
(Click "Yes" if a dialog box pops up saying "The Network is not complete. Do you want to continue?".)
Delete "Windows Logon" and/or "Microsoft Family Logon".
Close the Network Panel and Control Panel and restart the computer.[/list=1]
The login prompt should be gone!