Help....Norton does not work and no internet connection

Just downloaded Norton 2010 a couple of days ago my desktop.  On Friday my wife said she ran a system scan and said it found several problems and she left the screen up for me to take care of them when I got home.  However my son got on the computer before I could see the problems.  On sat morning I turned on the computer and it would not boot up and I finally got it booted up my going back to a restore point.  Once I got online the computer wouldn't connect to the Internet and I can not open Norton, the window security center says I don't have any antivirus software installed either.  I tried all the network repair tools in windows and still can get a connection.  Any suggestions???

 

Thanks