Norton (360) Community Watch does not complete or stop

When I look in Check Norton  Tasks  (Norton 360) and looking at the date - 10.12.13, it was showing as running all this time and not completeing.

Today I clicked on the icon and it has been showing as stopping ever since. As in the attached image

 

Can someone please tell me how to make it stop and then run again through to  complete.

 

All help much appreciatednorton.jpg