Your processor comes with Intel® HD Graphics™, which does not receive driver support in Windows 8 directly from Intel®. If you are running the retail version of Windows 8*, it will come with a default graphics driver for your processor. Additionally, Microsoft has recently released an update through Windows Update to install a newer version of the in-box driver, which will be compatible with your processor.
Well, what I have read and lately verified by myself, these in-box drivers for W8 are not complete. Somebody says, there are opengl drivers missing, I don't know, but I'm sure, only in-box drivers don't work on 100%.
I have downloaded older W7 drivers (supporting 1st gen of intel core processor) and installed them in W8 (throught changed igdlh64.inf and test mode in W8). Suddenly, in bechmark, I had almost 2x better results and OS worked slightly better.
After that, I used Windows update and left W8 install the in-box drivers. Good performances stayed the same like with the old w7 driver, bechmark was better about 0.1 points.
I'm sure, it's quite clear, that something from older drivers is missing in the "in-box" one for W8. And I'm sure, it's mistake and it should be repaired.
Of course, It's all about 1st gen. core processors only.
You are correct Karel,
The in-box driver for Windows 8 (2702) does not come with most features, incluidng OpenGL. That is why they released the .2858 driver. It comes with OpenGL and more features than the in-box, and is compatible with 1st gen HD Graphics™.