Norton 360 Firewall disabled suddenly after 3 months of activitation

OS: Windows 7 Professional 64 bit.

 

My Norton 360 worked great for first 3 months,but now not able to enable firewall in action center.In action center, "Turn on Norton 360" >> " Yes I trust the publisher" -  does nothing. This started happening all of a sudden. No new software installed recently. I tried to uninstall, shutdown,restart & reinstall didnt help.

 

Samething happened to me in my last year Norton360 as well. But i dont remember how i fixed it.

 

Would appreciate if someone help on this.