My Xbox or game is messed up

Hello,
I have gotten the Sims 3 on my xbox and it just recently started to not work. I have everything on my hardrive but whenever the start screen loads and I click on my hard drive to save it starts to load then freezes. I've had the xbox for a while but I've had no problems with any of my other games. I tried everything and it really makes me mad because I've had no problems with this for about 3 months but it just randomly started happening.
(Also my Xbox fell off of my tv stand which isn't that high like about maybe a foot) the day before but still all my other games were working. And when I load the game it sounds like the disk stops running.