Download Codec Installation Package. This package can be used as an alternative to automatically downloading Windows Media Codecs, or to correct problems experienced with previously-downloaded codecs. LINK.
*Install only codecs, filters, or plug-ins from trusted, authorized sources, such as the website of the official supplier. Even then, use caution: some codec suppliers offer minimal customer support. Before installing any digital media components, set a system restore point. The restore point enables you to return to your original system configuration, if necessary. And I think this link is trustable. If you are worried, just create a restore point before. LINK.