I now realise that I cannot reach the Identity Safe via the Norton icon on the task-bar. From the main window I click on Identity>Identity Safe and the Vault password input box appears (even when the Vault is already open. After I input the password (correctly!) the password box stays on the screen which I then have to close via the X in the top right hand corner. All that does is take me back to the previous screen and then I am in a continual loop. Not good.
This is with Windows 7 Home Premium SP1 64-bit.