Hello Marcos
I just shut down nod32 via your instruction shift+X and yes the message remains there when starting up again via start menu.
The error does not occur from the get go every time I start windows, its a real hit and miss sort of thing, it happens whenever it wants to, it has a mind of its own.
I can start an on-demand scan, smart scan without being told I cannot. the error message on the main page still remains there though
Thanks
Gourcuff