Microsoft is warning of a "critical" security flaw in most versions of its Windows operating system.
Attackers could exploit a vulnerability in the software that underlies many database functions and take over the user's computer.
Microsoft is urging users of Windows 2000, Millennium, 98and NT 4.0to download a software patch from the company's security website. Microsoft's newest version, Windows XP, does not have the problem.
It is Microsoft's 65th security bulletin of the year.
The security bulletin is the first to be issued in a simpler format, which Microsoft adopted due to complaints that its bulletins were overly detailed and confusing.
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