07-17-2011 08:49 AM - edited 07-17-2011 08:49 AM
Welcome to Norton Community!
There is no pop-up/ad blocker feature in Norton 360 Version 5.0. If you have turned off the pop-blocker from your browser(Internet Explorer or Firefox), you have to enable it from the browser settings. In Firefox, go to Tools > Options > Content tab, and make sure that Block Pop-up windows is checked(enabled). In Internet Explorer, go to Tools > Internet Options > Privacy tab, and make sure that Turn on pop-up blocker is checked(enabled).
If the problem persists, please post a screenshot of the pop-ups you are getting. If you are getting false security alerts, it can be due to adware/spyware infection. You can download and run Norton Power Eraser tool :
Go for Rootkit Scan and Restart the computer. Check if it detects any threats and if it does, please provide us the filename and other details.