Internet Explorer 8 allegedly has a serious security flaw that would allow an attacker to remotely take control of a users computer. And since Windows XP users cant upgrade to a more modern version of the popular browser and wont be receiving any more official security updates, its XP users who are most at risk. Whats more, Microsoft allegedly knew about this flaw back in October, and did nothing, according to Zero Day Initiative, an HP-sponsored program that rewards security experts for finding software flaws.