If you update the system time to 61 days in the future, you can force the machine to boot thawed. Standard mode will update it's trial expiration every time the computer starts. I've heard, but not personally confirmed, that the way Deep Freeze enforces trial mode vs regular mode is through the system date. You've got to alter some files (probably using VolumeShadowCopy) that are used by Windows itself. Deep Freeze Mac 2.03 is a straightforward, easy-to-use utility that does what it claims to do: automatically reset a Mac to pristine condition after a restart. It's all software in the end, so I suppose there must be a way to do this on a thawed computer without re-installing the operating system - but it's more than just changing the registry. This means you may also need to hard-reset your BIOS.
Most frozen computers will also disable booting from anywhere but the frozen hard disk in the BIOS, and then lock the BIOS to prevent changes. If you can't do this, you can still boot from a different location like a CD or DVD and re-install your operating system. The normal way to uninstall Deep Freeze is to re-run the installation program.
You also need to make sure you have an equivalent kernel driver to handle the disk requests (normally now, rather using the frozen method). But you can't just remove a kernel driver by changing a few registry keys. There is also a service that runs, and you can disable that service (don't: it will break your system). Secondly, Deep Freeze works (in part) through a low-level kernel driver for your hard disk and SATA/ IDE bus. Otherwise the changes you made to perform the uninstall are lost along with everything else when you reboot. First and foremost, you cannot uninstall Deep Freeze until you thaw the machine.
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