Surpass the Windows Log On Screen

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From: DGappy (dgappy_at_cavignac.com)
Date: 09/20/04 

Date: Mon, 20 Sep 2004 10:06:17 -0700

One of the staff members in the office decided to play
around with there PC on Friday and went into My Computer -
Properties - Computer Name - and wanted to change there
computer name but instead they clicked on Member of
WORKGROUP, and put in a name there. Now we cannot log
onto the PC. There is no option for Domain when we log on
and I don't know the username or password (I have tried
Administrator, etc). Is there any way I can surpass the
windows login in screen and go into my computer and change
the domain back to the agency's domain, if so HOW?