Yesterday, I did manually Live Update to see if there was Virus Definitions Update and it says that my product was up to date. After, when I went to Symantec Web Site (Virus Definitions and Security Updates page), the update for April 27,2011 appeared. I do Live Update third times in the evening and one time this morning (5:30 AM Eastern Time) and it was the same thing. I do not think this is normal. Is there a problem with your systems or is it my computer? In addition, Tuesday evening, there was a Windows update (a new version for April 2011 of the Microsoft Windows Malicious Software Removal Tool).Can this Windows update affect Live Update on my computer? Finally, Monday, when I came back of a six-day vacation and started Live Update, there was more than 83 Megs. I did it all but I do not think this is normal to have this big update just after this absence. The same thing arrived after summer vacation in 2009 (more than 45Megs) and in 2010 (more than 78 Megs).Thank you for your help!