Microsoft Corp. confirms it is investigating reports that a security update for Internet Explorer has crippled some users ability to get on the Web with the browser. Users started posting messages to multiple Microsoft support newsgroups almost immediately after Microsoft released the MS07-069 security bulletin on Dec. 11. Users say they were unable to connect to the Internet, either because IE refused to open or because when it did open, it could not reach various sites. IE6 and IE7 balked at loading, or while loading, some pages, particularly home pages.”]