The following error message is displayed when you try to enable SmartGuard option for your virtual machine:
Unable to turn on the SmartGuard option.
Most probably, you are trying to enable SmartGuard for a virtual machine based on a Boot Camp partition.
Unfortunately Parallels Desktop does not support creating snapshots for Boot Camp based virtual machines, and thus it is impossible to enable SmartGuard option for them.
If you want to enable SmartGuard for your virtual machine, consider converting it to a regular virtual machine first.
You may do that by clicking on File > Import Boot Camp..., and following the instructions in the wizard window which opens.