Norton Internet secuity trial has locke up new PC

Please can anyone help.

A new PC (today) running Windows7 with a free trial of Internet secuity -

Was running well until a PC restart. I then found I had lost the ability to connect to or access my network / router.

I have tracked it down to a locked up Norton Internet security. The program is not running but cannot be started. Could not unistall (even with the uninstall tool) the whole computer is somehow locked down by the program. I know Im not the first. Any advice? Thanks.