Windows

Are the other two computers the same image of the third. Maybe the best and quickest way if that is the case is to take an image one of the other two pc's and reimage to pc that is not working.

Have you compared settings with the other two pc's?

No unfortunately the two computers that ARE working aren't the same. The ones that are working are an old laptop and a desktop system. The one that isn't working is a newer laptop. I've compared all the settings that I can think of between the working and not and I cannot see anything different.

Try with a different browser. I had the same problem with http site. I've used portable firefox from a USB, and the site worked fine. Trying to open the site with IE went to mysearchweb. Removing it from the system, and running antispyware software solved the problem. You can use ethersnoop or ethereal, to see what happens when IE tries to open the connection. That way I found the system reset by itself (actually thru the spyware) the connection with the remote server.

Good luck

more info please.

not access HTTPS sites does that mean you get a page can not be displayed message or that the https sites load slowly or load partially then stop?

Make sure you have MS05-025 cumulative update for IE 6 installed.

Several good suggestions here, I'm wondering if any of the sites are on the network vs. the Internet (security - local intranet). If the site it can't access is local look specifically in there and try adding the site as "trusted" and see if it makes a difference.

It would be great to know the error message(s) as well as what the event logs are saying at that same time.

Have you compared the settings under Internet options-advanced?

Am curious if you use a proxy server as well.

Are there any filters/restriction as far as proxy/firewall? Have you tried to swap IP addresses with one of the ones that work?

Make sure the site is not in your "Restricted sites" listing. And you might try adding it to "Trusted sites".