Windows users should expect to have another update from Microsoft waiting for them on their computers.
The software giant issued a patch Wednesday morning to plug a critical security hole that could allow an attacker to take control of computers running any version of Windows except for Windows ME.
A group of Polish hackers and independent security consultants, known as the Last Stage of Delirium, discovered the flaw and worked with Microsoft to fix it.
"It should be emphasized that this vulnerability poses an enormous threat, and appropriate patches provided by Microsoft should be immediately applied," the group said in an advisory posted to its Web site. The group said that programs designed to exploit the vulnerability will likely be available on the Internet soon.
The flaw is in a component of the operating system that allows other computers to request the Windows system perform an action or service. The component, known as the remote procedure call (RPC) process, facilitates such activities such as sharing files and allowing others to use the computer's printer.