I moved this to SecurityCenter for a wider audience. It's an old tool and I am not sure what it changes to be honest. Until someone with more knowledge comes along I can only suggest to right-click the network icon near the clock and select Diagnose and Repair.
Or you may have to set up your internet connection again in Control Panel.
Technical Support for your area will be open on Monday: http://service.mcafee.com/TechSupportHome.aspx?lc=1036&sg=TS and they would be best equipped to answer your questions.
But hopefully someone else will spot this and offer assistance.
Ok. Thank you, Ex_Brit.