Problem: Networking works fine & both computers can access the internet. 1st computer (server) can access everything. 2nd computer (host) can access some secure web sites (gaming sites that require a password) but not others (some download gaming sites and very secure sites that require sensitive info).
What I've done thus far: Turned off the Norton programs on 2nd computer. Checked firewall settings on 1st computer, and all seems to be in order. Deleted "restricted" sites in Internet Options on 2nd computer and lowered security levels. Router settings seem to be okay since both computers can access the web.
Problem seems to have started when 2nd computer downloaded AOL Rider, which has since been deleted. Perhaps something there is still running or blocking without my knowledge? (I NEVER download any of AOL's garbage. Seems to cause a lot of problems and conflicts.)
My next step is to reformat the hard drive on 2nd computer tomorrow. Before I do that, maybe someone here has an idea as to what's going on.