Windows Media Services 4.1
Microsoft Windows 2000
Subsequent to the release of this update Microsoft was made aware that under certain circumstances the original update provided with this bulletin did not replace the vulnerable file on the hard drive. These situations involved whether or not Windows Media Services was uninstalled previous to the application of the update. Microsoft has addressed this issue & is re-releasing the update.
Note - If you didn't need the previous update that Per posted you'll not need this either.