Hello,
Request you to please let us know the Version of Symantec Endpoint Protection installed on your machine.
You can try to enter password "symantec"
OR
To delete GUI password follow the steps:
Open the registry
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Symantec Endpoint Protection\SMC
Change the value for SmcGuiHasPassword from 1 to 0
Restart the SMC service
To delete uninstall password follow the steps:
HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Symantec Endpoint Protection\AV\AdministratorOnly\Security\UseVPUninstallPassword
Set to 0 to disable it.
OR
Use the cleanwipe tool to remove SEP.
You need to contact support to receive latest cleanwipe tool.