There are legacy tools specifically designed to strip the Deep Freeze password from the memory. One of the most famous historical tools for older versions (like 7.51) is simply called "Anti Deep Freeze."
: If you need to remove Deep Freeze from a machine you own or administer, use the official method. If you’ve lost the password and own the license, contact Faronics support. Avoid downloading “Anti Deep Freeze 7.51” from shady sites. anti deep freeze 7.51
Is the computer a or part of a managed network ? There are legacy tools specifically designed to strip