Microsoft's Anti-Spyware program is causing troubles for people who also use Symantec's Norton Anti-Virus software; apparently, a recent update to Microsoft's anti-spyware application flags Norton as a password-stealing program and prompts users to remove it.
Update: 10:58 p.m. ET: I heard from Microsoft, and they say the problem is limited to customers running Symantec Antivirus (SAV) Corporate Edition versions 7, 8, 9 or 10 or Symantec Client Security (SCS) versions 1, 2 or 3 in combination with Windows AntiSpyware Beta 1. "The beta software will prompt and allow the user to remove a registry key containing subkeys belonging to these Symantec products. The deletion of these registry keys will cause all versions of the SAV and SCS software to stop operating correctly. No files are removed in this situation, only registry keys."
The rest of the statement Microsoft sent me says: "Once this issue was discovered, Microsoft quickly released a new signature set (5807) to remove this false positive. Both companies are working jointly together to identify the number of affected customers, which we believe to be very limited. Microsoft and Symantec are working jointly on a solution to restore normal operation of the Symantec software. Until this solution is available, customers can utilize System Restore in Windows XP to restore to an earlier point prior to the removal of the registry keys, or reinstall their client software."
tech.memeorandum @ 11:05 AM ET, February 13, 2006