Microsoft isn't the only company re-issuing security patches this month. Intel plans to re-release a critical security patch for its Centrino platform because of a memory-hogging bug. The move does not affect Apple's Intel-based Macs.

The updated patch should be available on Intel's website today, said Amy Martin, an Intel spokeswoman. At issue is a bug in the Proset wireless connection software that came with the update. This flaw causes Proset to consume more and more of the PC's memory, ultimately bringing performance to a grinding halt.

When Intel released the patch earlier this month, it contained security fixes for flaws in some versions of the Pro/Wireless Network Connection drivers as well as the Proset software. The most serious of these bugs "could have been exploited by a remote attacker to execute malicious code," Martins said. "The others would have just resulted in a denial of service."

Mikko Hypponen, chief research officer with F-Secure, installed the buggy update on his PC and found that it was using about 600MB of real and virtual memory on his system within three days.

Intel isn't alone with patch problems this month.

Microsoft also re-issued a patch for its Windows-based Internet Explorer browser yesterday, just days after security researchers said they'd found a critical security vulnerability that was introduced in the update.