I am trying to access a certain web site. I never had trouble bringing it up before. Now, when I type in the web site name in the address bar, up comes a message: "Web Site Could Not Be Found". Have tried it over and over and same thing. Any suggestions? I also called the company itself and they had no plausible reason why this is happening. Thanks

Clear your cache and start over.
Could well be an issue with the site itself.