Your technical understanding of Direct X is wrong. Just because you have a Direct X 11 capable card does not mean that you will always run everything in Direct X 11. Certain software utilizes Direct X 9, actually most applications/programs do. Some utilize Direct X 10 and others Direct X 11. I don't want to confuse you, and its ok. Don't panic, just install this http://www.microsoft.com/en-us/downl...ils.aspx?id=35 and it should be ok.
Some reasoning as to why you would ever need to update your Direct X...
"The first DirectX® version was released in September 1995 as a software development Kit for Windows® games. It allowed programmers to integrate or create graphic images, sprites, overlays and game elements including sound.The DirectX interface became the standard for programming games for PCs. Video card makers would have to ensure that their cards responded to the DirectX interface correctly by writing video drivers that worked. As with all software the drivers sometimes contained bugs so the system was not perfect.
But technical innovation didn't stop. As new cards came out new capabilities and new issues followed. Eventually video cards could start displaying 3D images with special graphics processing units, and they could display more colors, and they could display higher resolutions. As the hardware evolved and became more powerful DirectX had too evolved .If a game company wants to use the very latest features of the video hardware then they need to use the very latest version of DirectX. That's why many commercial games which often compete in the marketplace by providing the very latest and greatest video require you to run the latest version of DirectX.
Though DirectX is the most popular used API, it is not the only one. OpenGl is a cross platform API, that means it is compatible across all platforms – Windows, Linux or Mac. OpenGl and DirectX are always compared and though DirectX is the dominating the market right now, some people feel that OpenGl is the future of the gaming industry"
from this site http://tech-analyser.blogspot.com/20...e-need-it.html