On the Surface’s Windows RT, you cannot install alternative browsers. This means no AdBlock.
There is a workaround to this, using IE10’s “Tracking Protection”. First, fire up desktop IE10, click the little gear in the top right and select Safety -> Tracking Protection. Click on “Get a Tracking Protection List online…”.
You should see a list of tracking protection lists on Microsoft’s site. You will want to click Add next to the Easylist lists. These might not cover all ads – feel free to add a few more.
With these lists added to IE10, both the Desktop and Metro versions will filter out the ads. This method is not quite as good as AdBlock which removes the ads from the screen entirely, but is better than nothing.
See before and after screenshots of The Register in Metro IE10 below.