The retraction means that IT administrators will need to redo work they did earlier this month when they rolled out the original MS10-025. "You will need to reapply this bulletin to any machine that you have already patched in your April Patch Tuesday cycle," noted Jason Miller, data and security team manager for Roseville, Minn.-based Shavlik Technologies, in an e-mail.

A message left with Fabien Perigau, the researcher who reported the vulnerability to Microsoft last summer, and who was also credited with showing the company that the original patch didn't fix the flaw, did not respond to a request for comment left with his employer, Paris-based CERT-Lexsi.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld . Follow Gregg on Twitter at @gkeizer or subscribe to Gregg's RSS feed . His e-mail address is gkeizer@ix.netcom.com .

in Computerworld's Security Knowledge Center.