If you do not want a virtual machine to store the changes you make to it during the working session, you can start this virtual machine in Safe Mode. To be able to start the virtual machine in Safe Mode, you need to add the Safe Mode button to the Parallels Desktop toolbar first. To this effect:
When you have added the Safe Mode button to the toolbar, you can use this button for starting the virtual machine in Safe Mode. When you shut down a virtual machine operating in Safe Mode, you will be asked whether you want to discard the changes made to the virtual machine's hard disk or to apply them:
If you want the virtual machine to permanently work in Safe Mode, you can enable the Undo Disks option in the Startup and Shutdown pane of Virtual Machine Configuration :
Fore more information about the Undo Disks option, refer to Startup and Shutdown Settings .
Usage Tip
Running the virtual machine in Safe Mode can be useful when testing the behaviour of some applications to make sure that they cannot damage your computer.