If you’ve ever needed a little Computer help, now could be the time! Why? Just last night the FBI deactivated a network of bots that had been playing with your DNS settings, and showing you ads that you didn’t know weren’t legitimate.
The bad news now is that with the updated DNS (domain settings) you may find it difficult (or impossible) to visit the usual sites, since the connected computer has been turned off.
One command tool that is quite useful would be to flush out the old settings. There is help here on how to flush out your DNS settings.