PCWorld: Users Irate Oer McAfee Virus Update Screw-up
The virus definition update resulted in a vital operating system file on XP computers being mistakenly quarantined as virus-infected. Solution: don’t download the update and if you already have, install the recovery patch from McAfee.
“A flawed McAfee antivirus update sent enterprise administrators scrambling today as the new signatures quarantined a crucial Windows system file, crippling an unknown number of Windows XP computers, according to messages on the company’s support forum.
The forum has since gone offline.”