System freezes during idle time scan

I came to this page because I did a search - having a similar problem today - except my system is freezing when Norton is doing an idle time scan.  Has Norton provided an update that has a glitch in it?   It's VERY frustrating.  I have to shut down my computer and reboot each time...then everything is back to normal until Norton does an idle time scan again. ( I do not have any fancy spyware software on my system.)

 

I have never used safe mode.  If I do a scan in safe mode,  how do I then go back to normal?

 

Cheers

Lee