Microsoft Knowledge Base Article 891717 contains the following introduction:
After you run the Microsoft Windows Malicious Software Removal Tool, you receive a message that states that errors were found during the scan, and you are directed to this article for more information.
Note Some of these errors are informational messages or minor issues and may not require additional action.
For general information regarding this tool, see the following Microsoft Knowledge Base article:
890830 The Microsoft Windows Malicious Software Removal Tool helps to remove specific, prevalent malicious software from computers that are running Windows 2000, Windows XP, or Windows Server 2003