Norton 360 Tuneup Error

When running Norton 360 Tuneup, receive an ERROR when Internet Explorer History Files runs.  Details of this error:  Another instance of this task is running.  Please wait to finish.

Error first appeared yesterday evening, 31 Oct 2014.  Shutdown computer overnight and no change in error when running Tune up the next day, 1 Nov 2014. Currently, I am manually using Internet Explorer Tools to delete  Internet Explorer History files.

Seeking fix action to clear error.

Operating System:  Windows 8; Norton 360 version:  20.5.0.28