The URI for RootsWeb is
http://rootsweb.comAre you unable to reach it using your browser of choice?
What is your browser of choice?
Have you tried a different browser?
Error messages such as you describe are sometimes the result of conflicts created by browser plug-ins. Try disabling all of them and check to see if you can then access the site. You can then re-enable them one-by-one until the problem is identified.