NIS 2013 Quick Scan-not working

I manually started Quick scan and it ran for about 5 minutes with no progress..I tried shutting it down with no success.

I tried rebooting & complete shut down..Now If I try to run quick scan it gives me an error.

Norton says it's still running.

It never stops.

 

Windows 8 Pro

I already uninstalled and ran Norton removal tool and reinstalled.

 

Grumpy