You can always try tricking the game into thinking you've won.
During the race get right in front of an object (as close as posible)(at any speed) and press the forfit button (Xbox-White) and (PC-not quite sure yet). You should run into an object and bounce off ending the race and winning it if done correctly.
DeathScepter is right. To use a dark restricted crystal (if you are currently LS), just put a light restricted crystal on the lightsaber and the two restrictions will cancel out. And it also works vice-versa (if you are playing DS).
After reading that webpage I've concluded that Darth Bane must be The Sith'ari. He got rid of the old Sith Order and pretty much started a new one, the Rule of Two.
I only use duel-bladed swords/sabors if the character is a Soldier, Jedi Guardian, or Jedi Weapons Master. If not I have the character using single-blades, unless they already came with the Two Weapons Feat.
It's not a virus, it happened to me also. Just try relaunching the game and that should fix it. If that doesn't fix the problem try re-installing the game.