Here's an update..... Yesterday I tried to download AVG Antivirus but, partway thru, I received a message that several files were corrupted. I went back, tried again and got the same result.
I moved on and downloaded Comodo firewall. I was a little surprised to learn that it estimated over 8 hours to complete the download. I let it run and finally it was done! I turned off my computer, went to bed and installed it early this morning. After work, I turned off Norton's firewall and got my email. Just for the heck of it, I clicked on two diffent links in my emails and connected to them OK!
I plan on trying to continue the downloads you suggested and be free from Norton completely! Thanks again and I'll keep you posted of my progress.
By the way, I really like the way the Comodo Firewall communicates and lets you know what it's doing!