An update is available for Windows 7 and for Windows Server 2008 R2 which provides new functionality and performance improvements for the graphics platform
这个update与IE9颇有关系。
KB2120976, KB2028551-v2, KB2028560 are IE9 updates. They make DirectX and mediafoundation compatible with functions in IE9 (GPU acceleration, video decoding and stuff like that). This does not mean they shouldnt be applyed in case of not having IE9, because they simply update Windows components. http://forums.mydigitallife.info/threads/19461-Windows-Hotfix-repository?p=287300#post287300