IE7 cannot open web site

Since a recent MS update download, IE7 has been unable to open one web site
that I visit regularly. I have tried all the fixes recommended by Windows
help with no success. I removed each update one at a time, but that did not
resolve the issue. I consulted wih the web site's web master, but he was
unable to help resolve the issue, and suggested that it might have to do with
firewall protection. I suspect that Norton (v.10.4.0.13) may have something
to do with the problem, but turning off all Norton features did not help. I
have read similar questions in some other discussion groups, and tried their
recommended solutions to no avail. This is not an emergency situation, but it
is aggravating, and there might be other sites unavailable for the same
reason. If anyone has suggestions, I'll give them a try.