McAfee Security Center relies on Internet Explorer to function correctly (whether or not you use it). As I stated in post #10, IE must be anything BUT IE8 Beta - which causes blank window problems. So what version do you have? Bring up Internet Explorer and go to Help/About and post what it says. If it is IE8 final or IE7 go to Tools/Internet Options/Advanced and click the Reset button then click Apply and OK. Close and reopen IE and go to Tools/Manage Add-0ns and re-enable the add-ons.