Norton 360 disappearing

I reinstalled Norton 360 when I renewed about a month ago and all has been fine until today. When I went to fun the backup, I couldn't get the master menu to come up. I was able to run liveupdate with no problems off of the listing of programs in

my Vista index.  But can't do back up nor run any scan from either the desktop glyph nor the toolbar glyph.  Do I need

to reinstall it again from disk?  Theresa 

Never mind, I ran a diagnostic on the computer and restarted, and now it's fine.  Yeah!  And to mention. The message it

gave was error 8504, 104 which was related to Lenova RapidStart and that isn't on my computer.  Theresa

I reinstalled Norton 360 when I renewed about a month ago and all has been fine until today. When I went to fun the backup, I couldn't get the master menu to come up. I was able to run liveupdate with no problems off of the listing of programs in

my Vista index.  But can't do back up nor run any scan from either the desktop glyph nor the toolbar glyph.  Do I need

to reinstall it again from disk?  Theresa