Microsoft Warns of New Attack

Opening a Windows document? Be extra careful, especially if it's a Word file. Software giant Microsoft has issued a warning that hackers may take advantage of an unptached flaw in the Windows operating system to install a malicious software on your PC.

The reported attack, under investigation by the Redmond-based company, involves a malicious Word document, but there may be other ways of exploiting the flaw, Microsoft said.

In a security advisory posted on its site, Microsoft said, "Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources."