What would you need an SDK (Software Development Kit)
for? Are you going to write code?
Here's a link to the latest: http://www.microsoft.com/downloads/details.aspx?FamilyID=04ac064b-00d1-474e-b7b1-442d8712d553&displaylang=en
If that's what you used, then you *are* updated. At the moment, it's not possible to be newer than that, unless you want to obtain/play with beta software.
So, any ideas about the windows experience rating facing error when it comes to direct3d?
Your original post mentioned no error... Are you experiencing errors? DXDiag should tell you if it's running properly or not. If you are experiencing errors, then I recommend first removing your existing video drivers and any related apps - restart - then install the newest versions from your maker's websitel. If not, then IMHO you are obsessing and should stop doing that.