Pull the network cards out of the machine & then put in phoney UserID & hit "ESC" when the logon screen appears. As far as I can remember this lock down restriction only works in combination with enabling "logon to an NT domain" on the network card setup plus the NT network must be recognized during bootup. Seems to me we use to break into Win95 systems with these restrictions enabled by simply pulling the LAN cable out of the card before powerup. Once you get in, immediately edit the registry to remove any problem restrictions.
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Jack