Heur.AdvML.C

Every time I start my computer I get a Norton Security notice (within 2 to 3 minutes of startup)

"Auto-Protect is processing security risk Heur.AdvML.C"

The popup notice will stay up until I close it

As soon as the NS popup notice appears I am unable to open any other application (IE, Chrome, Windows explorer). In fact my computer is completely unresponsive.

I have rebooted and opened Task Manager before I get the popup - Memory, CPU, and Disk are all OK, even after the NS popup alert,

I have checked my NS Security History. Heur.AdvML.C is not showing up in the event history and the file is not quarantined