You can download mods that make the game run faster, look better, have a much better UI and remove the rather silly level-scaling that makes the game insanely easy. You can also download one that allows you to ride your horse in cities (it always seemed weird dropping off your horse outside the city gates and then walking for 20 minutes across the city).

Of course if you have the game on console, this will be of no help. Erm, sorry.