unfortunately, AIM (AOL Instant Messenger) has nothing to do with mirc. There could be any number of reasons you can't connect and your home page has lost formatting. Norton Go Back shouldnt have anything to do with this though it would allow you to roll back to a previous time on your PC, but only within the past 7 days IIRC. You COULD try to change the settings on your firewall, BUT, if you havent changed anything in the last day or two (since you WERE able to connect) I doubt it would be that. Have you tried going to AIM's homepage for help on that program's issues?
Those who fail history are doomed to repeat it