Just rape the start-up files. Destroy boot.ini.
(
Ttssattsr,
Mon 21 Feb 2011, 13:02,
archived)
or
reboot it and set a password in the bios.
(
An Egg ,D,
Mon 21 Feb 2011, 13:15,
archived)
or something like this (then remove the icons and toolbars)
(
An Egg ,D,
Mon 21 Feb 2011, 13:32,
archived)