Hello,
In your case, it is not recommended to have the Symantec Endpoint Protection installed on the machine while migration of Operating System.
I would recommend you to uninstall SEP product and then follow the OS Migration steps. Once the OS is migrated, you may then reinstall the SEP product.
Check this Article:
Should Symantec Endpoint Protection be uninstalled from the computer before upgrading Microsoft Windows to a newer version of Windows?
http://www.symantec.com/docs/TECH197095
Hope that helps!!