Deep Freeze only protects the operating system in a 'fresh booted' state. The protections the software offers can often be bypassed, for example, by installing a malicious, system wide application, especially if other users find this application popular and accept that it being installed when they log in means it is authentic. One user could install a modified version of a popular web browser that's been designed to save passwords to a server on the internet, then log out, then other users who log in would see that browser and may use it out of preference. To use the computer more safely, the user would have to restart the computer first.
Deep Freeze also can not protect against direct access to a disk drive when the hosting operating system is not in control of the system. That is, if another operating system can be boot from another hard disk , a USB device , or optical media , they will have real access to the contents of the frozen and unfrozen partitions. This may be protected against by setting the first hard disk as the only bootable hard disk and password protecting the BIOS configuration, but if physical access to the computer is available, this can be bypassed with a BIOS reset or rearranging the hard drive installation.
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