Need Help in updating HD Graphics 4000

I went to the downloads area, I clicked on the detect button and says I have version 8.15.10.2696 HD 4000, says I need to update to 15.33.29.64.3945, so I clicked on the download button and says does not exists. How do I go about updating this graphics thing. I have a 2year old Dell laptop win 7 64 intel core i5, any help would much appreciated here, crocheter