Microsoft has warned users of its Windows operating system of a critical security flaw in its software that could allow attackers to take complete control of a computer. On Tuesday, December 13th, the company announced that a weakness exists in its Internet Explorer web browser that an attacker could exploit to take over a P-C if the user happened to visit an infected website. The company has already issued a patch to fix the problem as part of its monthly security bulletin. Computer security experts and Microsoft are urging users to download and install the patch which is available at www.microsoft.com/security. Over 85% of the world's personal computers run on some version the Microsoft Windows operating system. In recent years, though, other operating systems such as Linux have been making inroads into the Microsoft empire by offering better security and an open architecture at a fraction of what Microsoft charges or for free. (Published reports)