Norton 360 has been froze up on full scan

I started running a full system scan and N360 is froze up on "Hacktool.Unreal.A".  It's been stuck on that for over an hour now.  Why is it freezing up?  Is this a virus? 

Would appreciate some help!

  

 

Edit:

I just tried to stop the scan and it is froze up and won't close now.  I will use task manager to end the task.  Why is this doing this?  It happened yesterday too and I ran the power erase, everything seemed to be fine til I ran the scan today again.