Norton 2011 keeps asking to activate on reboot

everything was working fine - nothing was changed or updated - about 3 weeks then all of a sudden everytime i reboot the computer norton 2011 keeps asking me to activate the product - any ideas ?

 

running on Win7 32bit

never

 

 

******

Nevermind found this link http://us.norton.com/support/kb/web_view.jsp?wv_type=public_web&docurl=20100917172028EN&ln=en_US 

 

also http://community.norton.com/t5/Norton-Internet-Security-Norton/NIS-2011-requires-activation-upon-every-bootup/td-p/306106