I lost the ability, on my laptop, to achieve either wireless or LAN internet connectivity. After several hours of trying every tech tweak I could think of, I got Verizon online tech support to spend an hour or so with me. They couldn't solve the problem, either, and said that the issue was with the computer. (If anybody from Verizon wants to trace that tech support call, it's Ticket number:{edited for privacy})
Convinced that they were correct I kept trying to discover if the problem was hardware based (weird, because I was able to connect to my Homegroup, just not get internet, while other computers using the same router had no issue) or software based. Early on I had shut down the firewall in the Verizon Internet Security Suite, and had always had the Windows firewall "off." i was ready to order replacement hardware for my laptop, when I checked the Windows firewall one more time. It reported that the VISS firewall was blocking access to public sites. I went back to the VISS and it still showed the firewall as "off." The only way to check this was to uninstall VISS. When I did that, the internet connection was restored immediately.
There are two problems here: the first is a glitch in the VISS that would allow something like this to happen. The second is that Verizon tech support didn't take a single look at the VISS - their own product! After several hours of my time spent on this, I'll be using another Anti-Virus program, probably a free one.