fable 2 froze on me the entire time I tried to find the warrants in the beginning so on a forum it said to download the game to the harddrive and run it off that and it worked perfect!!!!
now if all the games keep doing it and after you put it in your xbox 5 times and then it works, it's your disc drive and that's the same thing that happened to me, I just went ahead and sold that p.o.s on eBay and got $100 bucks out of it and just bought a new one since xbox was going to charge me like 100 bucks to fix it, no way!
depending how long you've had it--if it's been along time, i'd go ahead and buy a new one and sell your old one on ebay, I had the one I sold for two years with no problems until the DD messed up.