Deep Freeze does not differentiate between user data, application data, or a virus infecting the system. While this provides a very robust method of protecting the integrity of the computer, specific files and folders cannot be exempted from the actions of Deep Freeze. However, there are many methods to redirect applications and user data to a second volume, either physical or virtual, that can be marked as exempted from the actions of Deep Freeze. For the retention of user data please refer to the document linked below for the recommended methods for retaining users data on their system: http://www.faronics.com/whitepapers/DF_RetainUserData.pdf In Deep Freeze Enterprise, there are options to schedule Deep Freeze to turn on and off automatically to allow for the processing of Windows updates, antivirus updates, and any other periodic maintenance that needs to be performed on the client computers. For more information on the Scheduled Maintenance feature of Deep Freeze Enterprise refer