Updates are required for specific products because an update package contains bug fixes, new features, enhancements and in this case particular, you should keep all the updates installed along with the the encoder. If you allow encoder to update, it may increase the performance of video playback or provide additional support for new or old file formats. Windows Media Encoder updates itself through Windows update and you shouldn't worry that unnecessary updates will be installed when the process starts. Also you should keep updates in the future as a recommendation for keeping your system updated and stable.
