The critical Internet Explorer flaw that left every desktop version of Microsofts Web browser vulnerable was patched today (May 1) — even for Windows XP, the outdated operating system that Microsoft officially stopped supporting April 8. First revealed last Saturday (April 26), the vulnerability, present in IE 6 through 11, was so severe that the U.S. Department of Homeland Security even recommended that people avoid using Internet Explorer until the flaw was patched. Now that Microsoft has pushed out the patch, the update should install automatically if you have Automatic Updates enabled on your PC.