Google Search: hacking deep freeze: "If you CAN boot to a:\ then you can delete persi0.sys and replace it
with your own copy containing a known password. From my experience,
the persi0.sys filez from the trial versions work to replace the one's
from regular installations. persi0.sys also runs in Ring 0 and cannot
be deleted while DeepFreeze is running. Not with a process killer, not
with DOS, not with Process Explorer. If you ever figure it out, post
it for all to see and congratulate you!"