Help! why is my norton2010 suddenly not running - everything is a white box

i used norton2010  happily with windows 7 for past 3 months, adding passwords to norton safe, also setting up rules for email delivery in ms outlook, all licenced and auto update software. 

 

then 2 days ago norton is just a blank window - whenever i open or right click i just get white space, white boxes, and i cannot tell if norton running or not; coincidentally all my email is delivered to junk.  i first noticed this when i saw my safe passwords all disappeared frorm all sites i opened - i was always asked to enterpassword.

 

i did nothing specifically to cause this, though i do have regular update checks for norton, for microsoft, for the pc (sony vaio)  i have tried reboot; tried ownloads from norton and from sony but nothing makes any difference.

 

something simple but wrong has happened but i cannot see what it is?

 

help please?