I just upgraded Norton 360 version 3 to Norton 360 4.0. My PC runs Win 7 64 bit Professional and Office 2010 Professional. After the update Outlook 2010 and IE8 would not start. After uninstalling Norton 360 4.0, Outlook 2010 and IE8 still would not start. Nor did the installation of Norton 360 4.0 did set a restore point! I used my recent restore point and managed to get all software up and running again. I reinstalled Norton 360 3.0, updated it and everything works. I chatted with Norton tech support and they finally admitted there is a problem and they are working on it. They told me to keep using version 3.0. So be forewarned. read full review »