Why do I see the Windows Malicious Software Removal Tool reported as a missing service pack or update rollup?
MBSA reports on security-related best practices. The Windows Malicious Software Removal Tool is a cumulative, monthly update that removes the residue from known malicious software that may be left behind even after the security bulletin has been applied to the computer. Unless this tool is run periodically, there could be malicious files or settings present on the computer.
