Microsoft warns of three "critical" security flaws

Microsoft Corp. warns of three "critical" security flaws in its Windows operating system that could allow attackers to take control of a computer.

Microsoft, the world's top software company whose Windows operating system runs on 90 percent of the world's computers, issued patches to fix the problems as part of its monthly security bulletin. One of the critical vulnerabilities appears in some versions of Internet Explorer that could make it possible for an attacker to use the Web browser to take total control of a PC. The other two "critical" vulnerabilities were in the Windows operating system.